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CN116514767B - Chemiluminescent probe based on adamantine-1, 2-dioxetane and preparation method and application thereof - Google Patents

Chemiluminescent probe based on adamantine-1, 2-dioxetane and preparation method and application thereof Download PDF

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CN116514767B
CN116514767B CN202310267473.7A CN202310267473A CN116514767B CN 116514767 B CN116514767 B CN 116514767B CN 202310267473 A CN202310267473 A CN 202310267473A CN 116514767 B CN116514767 B CN 116514767B
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dioxetane
chemiluminescent probe
adamantene
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CN116514767A (en
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刘文栋
朱海亮
陈鲲
章晨润
贺思嵘
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Hubei Nanbo Bioengineering Co ltd
Guangzhou University
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Guangzhou University
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Abstract

The invention discloses a chemiluminescent probe based on adamantine-1, 2-dioxetane and a preparation method and application thereof. The probe has the following molecular formula, and the preparation method comprises the following steps: reacting 2- (4-nitrophenyl) -2-oxoacetic acid and 4-aminobenzyl alcohol in the presence of HATU, N-diisopropylethylamine to produce compound 1; mixing and dissolving the compound 2a, the compound 2b and piperidine, and then reacting to obtain a compound 2c; the compound 2c and the methyl blue are mixed in a solvent and then irradiated with white light, and meanwhile, the mixture is strongly foamed by air to generate a compound 2; reacting the compound 1 with the compound 2 under alkaline conditions to generate the probe. The chemiluminescent probe applied to detection of peroxynitrite has the advantages of good light stability, large Stokes shift, high quantum yield, capability of generating near infrared fluorescence and the like.

Description

Chemiluminescent probe based on adamantine-1, 2-dioxetane and preparation method and application thereof
Technical Field
The invention relates to a fluorescent probe, in particular to a chemiluminescent probe based on adamantine-1, 2-dioxetane, and a preparation method and application thereof.
Background
Both redox reactions and oxidative stress are involved in the etiology of many diseases and in the aging process, endogenous peroxynitrite (ONOO-) has been recognized as a strong oxidant in vivo. This chemical nature of peroxynitrite makes it a central biological causative agent of a variety of diseases, such as cardiovascular, neurodegenerative and inflammatory diseases. Knowing the important role of peroxynitrite in biological systems, it is quite valuable and interesting to develop sensitive and selective techniques for detecting peroxynitrite. To date, several methods for detecting peroxynitrite have been developed, including ultraviolet/visible spectroscopy, electrochemical analysis, electron spin resonance, and immunohistochemistry. However, the exact pathogenic role of peroxynitrite in biological systems is still not clear due to its short life span in vivo, high activity, low concentration, elusive nature. In contrast, fluorescence for peroxynitrite detection has evolved over the past decades because of its many advantages such as: high measurement efficiency, non-invasive detection, excellent spatial and temporal resolution, etc. Many fluorescent peroxynitrite sensors have been reported and applied to in vitro and in vivo imaging of peroxynitrite, which further facilitates the study of peroxynitrite behavior in biological processes. However, these probes may suffer from problems such as lower quantum yields and smaller stokes shifts.
Disclosure of Invention
In order to solve the technical problems, the invention firstly provides a chemiluminescent probe based on adamantene-1, 2-dioxetane. The invention adopts adamantine-1, 2-dioxetane as a luminous group to improve the optical performance of the probe, solves the problems of low quantum yield and small Stokes shift, and simultaneously discovers that the probe has the advantages of good light stability, large Stokes shift, high quantum yield, capability of generating enhanced fluorescence and the like when being used for detecting peroxynitrite.
Based on the second aspect of the invention, a preparation method of a chemiluminescent probe based on adamantine-1, 2-dioxetane is also provided, and a feasible process route is provided for industrial application of the product.
Based on the third aspect of the invention, the application of the chemiluminescent probe based on adamantene-1, 2-dioxetane in detecting endogenous peroxynitrite is also provided. The chemiluminescent probe can specifically react with peroxynitrite and generate a change of a fluorescent signal of turn on, and the content of peroxynitrite is detected by detecting the change of the fluorescent signal.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a chemiluminescent probe based on adamantene-1, 2-dioxetane, having the molecular structural expression:
a method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane, comprising the steps of:
s1, dissolving 2- (4-nitrophenyl) -2-oxo acetic acid and 2- (7-aza-benzotriazol) -N, N, N ', N' -tetramethyl urea hexafluorophosphate in anhydrous dichloromethane, then adding N, N-diisopropylethylamine, stirring at room temperature for 10-30min, finally adding 4-amino benzyl alcohol, and stirring at room temperature for reacting for 12-24h; after the reaction, methylene chloride was added to dilute the reaction solution, which was washed several times with saturated brine, and anhydrous NaSO 4 Drying, performing silica gel column chromatography, and purifying to obtain a compound 1;
s2, adding the compound 2a, the compound 2b and piperidine into a flask, and then adding acetonitrile as a solvent; placing the reaction solution in an oil bath at 90-120 ℃ for heat preservation reaction for 1-5h, and purifying by silica gel column chromatography to obtain a compound 2c;
s3, adding the compound 2c and methyl blue into a double-neck flask, taking anhydrous dichloromethane as a solvent, stirring, placing the flask in an ice bath, irradiating white light above the flask, and simultaneously, strongly foaming for 2-4 hours by using air; after the reaction is finished, purifying by silica gel column chromatography to obtain an orange solid compound 2;
s4, dissolving potassium carbonate in N, N-dimethylformamide, adding the compound 1 and the compound 2, stirring and reacting for 10-36h, and purifying by silica gel column chromatography to obtain the compound 3, namely the chemical fluorescent probe.
In a preferred embodiment of the invention, in step S1, the molar ratio of 2- (4-nitrophenyl) -2-oxoacetic acid, 4-aminobenzyl alcohol, 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethylurea hexafluorophosphate, N, N-diisopropylethylamine is 1 (1-1.5): (1-2): (20-50), for example, when the molar equivalent of 2- (4-nitrophenyl) -2-oxoacetic acid is 1, the molar equivalent of 4-aminobenzyl alcohol may be 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc., the molar equivalent of 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethylurea hexafluorophosphate may be 1, 1.2, 1.4, 1.6, 1.8, etc., and the molar equivalent of N, N-diisopropylethylamine may be 20, 25, 30, 35, 40, 45, 50, etc.
In a preferred embodiment of the invention, in step S2, the molar ratio of compound 2a, compound 2b, piperidine is 1 (0.8-1.2): (2-3), for example, when the molar equivalent of compound 2a is 1, the molar equivalent of compound 2b may be 0.8, 0.9, 1, 1.1, 1.2, etc., and the molar equivalent of piperidine may be 2, 2.2, 2.4, 2.6, 2.8, 3, etc.
In a preferred embodiment of the invention, in step S3, methyl blue is used in an amount of 1 to 10% by mole of compound 2c, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% by mole of compound 2c, etc.
In a preferred embodiment of the invention, in step S3, the white light is emitted as 150-300W LED light.
In a preferred embodiment of the invention, in step S4, the molar ratio of compound 1 to compound 2 is 1 (1-1.5), for example 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, etc.
In a preferred embodiment of the invention, in step S4, potassium carbonate is used in an amount of 10 to 20 times, for example 10 times, 12 times, 14 times, 16 times, 18 times, 20 times, etc., the amount of 1 mole of the compound.
Use of an adamantene-1, 2-dioxetane based chemiluminescent probe as described herein and an adamantene-1, 2-dioxetane based chemiluminescent probe prepared by the method as described herein in the field of detection of endogenous peroxynitrite.
The chemiluminescent probe uses adamantine-1, 2-dioxetane as a luminescent group, and has the advantages of good light stability, large Stokes shift, high quantum yield, capability of generating enhanced fluorescence and the like when being applied to detection of peroxynitrite.
Drawings
FIG. 1 is a graph of chemiluminescent probe as a function of fluorescence intensity.
Detailed Description
The invention will now be further illustrated by means of specific examples which are given solely by way of illustration of the invention and do not limit the scope thereof.
Unless otherwise specified, the starting materials and reagents in the examples of the present invention are all commercially available. Wherein, the compound 2a can be custom synthesized in Chongqing FuTENG medical Co., ltd, and also can be prepared by itself according to the following method:
0.1mmol of adamantanone and 0.25mmol of methyl 3-bromobenzoate were dissolved in 30ml of dimethyl sulfoxide, reacted for 24 hours in the presence of 0.01mmol of titanium trichloride catalyst and 0.01mmol of lithium aluminum hydride, extracted by adding water and dichloromethane, and the organic layer was purified by silica gel column chromatography to obtain an intermediate 2a'.
0.1mmol of intermediate 2a' and 0.3mmol of formic anhydride are mixed with 20ml of anhydrous dichloromethane solvent, friedel-crafts acylation reaction is carried out under the action of 0.01mmol of anhydrous aluminum trichloride catalyst, the reaction is finished after 12 days, water and dichloromethane are added for extraction, and an organic layer is purified by silica gel column chromatography to obtain the compound 2a.
[ example 1 ]
The chemiluminescent probe is prepared according to the following steps, and the reaction process expression is as follows:
(1) 1mmol of 2- (4-nitrophenyl) -2-oxoacetic acid and 1.2mmol of 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethyluronium Hexafluorophosphate (HATU) were dissolved in 15ml of anhydrous dichloromethane, 36.3mmol of N, N-diisopropylethylamine was then added, stirring was carried out at room temperature for 20min, and finally 1.1mmol of 4-aminobenzyl alcohol was added, and the reaction was carried out at room temperature with stirring for 12h. After the completion of the reaction, 10ml of methylene chloride was added to dilute the reaction mixture, which was washed 3 times with saturated brine, and anhydrous NaSO 4 And (3) performing silica gel column chromatography after drying, and purifying to obtain the compound 1.
1H NMR(500MHz,Chloroform-d):δ9.25(s,1H),8.45–8.36(m,2H),8.02–7.96(m,2H),7.91–7.83(m,2H),7.49–7.38(m,2H),4.46(s,2H),1.43(s,1H).
(2) 1.6mmol of compound 2a, 1.8mmol of compound 2b [ i.e., (3, 5-trimethylcyclohex-2-eneylene) malononitrile ] and 3.2mmol of piperidine were added to the flask, followed by addition of 20ml of acetonitrile as a solvent. The reaction solution was placed in an oil bath at 90℃and reacted for 2 hours under thermal insulation. Purifying by silica gel column chromatography to obtain compound 2c.
1H NMR(500MHz,Chloroform-d):δ7.48–7.43(m,2H),7.04(dd,J=11.2,9.6Hz,2H),6.65(d,J=15.0Hz,1H),6.35(s,1H),3.57(s,3H),2.79(p,J=3.1Hz,2H),2.65(s,2H),2.57(d,J=0.9Hz,2H),1.92–1.78(m,7H),1.61(t,J=3.1Hz,4H),1.05(t,J=3.1Hz,1H),0.94(s,6H).
(3) 0.4mmol of compound 2c, 0.025mmol of Methyl Blue (MB) were added to a two-necked flask, anhydrous methylene chloride was used as a solvent, and after stirring, the flask was placed in an ice bath, and white light (LED 150W) was irradiated over the flask while strongly bubbling with air for 2 hours. After the reaction, silica gel column chromatography purification was performed to obtain orange solid compound 2.
1H NMR(500MHz,Chloroform-d):δ7.66–7.53(m,2H),7.25–7.07(m,1H),7.01(s,1H),6.65(d,J=30.2Hz,1H),6.38(t,J=2.0Hz,1H),3.46(s,3H),2.70(s,2H),2.60(d,J=2.0Hz,2H),2.23–2.15(m,4H),2.08(t,J=6.4Hz,2H),2.01–1.84(m,2H),1.75(t,J=6.2Hz,1H),1.06(t,J=6.2Hz,1H),0.97(s,6H),0.82(dt,J=10.0,6.3Hz,4H).
(4) Will 3.6mmol K 2 CO 3 Dissolving in 10ml DMF, adding 0.3mmol of compound 1 and 0.4mmol of compound 2, stirring for reaction for 12h, and purifying by silica gel column chromatography to obtain compound 3, namely the chemofluorescent probe.
1H NMR(500MHz,Chloroform-d):δ9.51(s,1H),8.34(m,2H),8.16(m,2H),7.69(m,2H),7.35(dt,J=7.8,1.0Hz,2H),7.31(d,J=14.2Hz,1H),7.24(d,J=8.0Hz,1H),7.08(dd,J=14.3,1.3Hz,1H),6.95(dd,J=8.0,2.3Hz,1H),6.88(d,J=2.3Hz,1H),6.45(q,J=1.1Hz,1H),4.99(q,J=0.8Hz,2H),3.48(s,2H),2.62(p,J=5.3Hz,2H),2.39(m,3H),2.33(m,1H),2.02(dq,J=9.6,4.7Hz,2H),1.74(m,8H),1.69(t,J=5.2Hz,2H),1.06(s,2H),1.01(s,2H).
[ example 2 ]
The chemiluminescent probe was prepared according to the following steps:
(1) 1mmol of 2- (4-nitrophenyl) -2-oxoacetic acid and 1.5mmol of 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethyluronium Hexafluorophosphate (HATU) were dissolved in 20ml of anhydrous dichloromethane, 25mmol of N, N-diisopropylethylamine was added thereto, and the mixture was stirred at room temperature for 20 minutes, and finally 1.3mmol of 4-aminobenzyl alcohol was added thereto, and the mixture was stirred at room temperature for 20 hours. After the completion of the reaction, 10ml of methylene chloride was added to dilute the reaction mixture, which was washed 3 times with saturated brine, and anhydrous NaSO 4 And (3) performing silica gel column chromatography after drying, and purifying to obtain the compound 1.
(2) 1.6mmol of compound 2a, 1.6mmol of compound 2b [ i.e., (3, 5-trimethylcyclohex-2-eneylene) malononitrile ] and 4.8mmol of piperidine were added to the flask, followed by addition of 20ml of acetonitrile as a solvent. The reaction solution was placed in an oil bath at 100℃for a thermal insulation reaction for 4 hours. Purifying by silica gel column chromatography to obtain compound 2c.
(3) 0.4mmol of compound 2c, 0.005mmol of Methyl Blue (MB) were added to a two-necked flask, anhydrous methylene chloride was used as a solvent, and after stirring, the flask was placed in an ice bath, and white light (LED 150W) was irradiated over the flask while strongly bubbling with air for 4 hours. After the reaction, silica gel column chromatography purification was performed to obtain orange solid compound 2.
(4) Will 5.5mmol K 2 CO 3 Dissolving in 10ml DMF, adding 0.3mmol of compound 1 and 0.3mmol of compound 2, stirring for reaction for 36h, and purifying by silica gel column chromatography to obtain compound 3, namely the chemofluorescent probe.
[ example 3 ]
The chemiluminescent probe was prepared according to the following steps:
(1) 1mmol of 2- (4-nitrophenyl) -2-oxoacetic acid and 1.8mmol of 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethyluronium Hexafluorophosphate (HATU) were dissolved in 20ml of anhydrous dichloromethane, 46.4mmol of N, N-diisopropylethylamine was added thereto, and the mixture was stirred at room temperature for 20 minutes, and finally 1.5mmol of 4-aminobenzyl alcohol was added thereto, and the reaction was stirred at room temperature for 24 hours. After the completion of the reaction, 10ml of methylene chloride was added to dilute the reaction mixture, which was washed 3 times with saturated brine, and anhydrous NaSO 4 And (3) performing silica gel column chromatography after drying, and purifying to obtain the compound 1.
(2) 1.6mmol of compound 2a, 1.3mmol of compound 2b [ i.e., (3, 5-trimethylcyclohex-2-enylidene) malononitrile ] and 4mmol of piperidine were added to the flask, followed by addition of 20ml of acetonitrile as a solvent. The reaction solution was placed in an oil bath at 120℃for 5 hours of thermal insulation reaction. Purifying by silica gel column chromatography to obtain compound 2c.
(3) 0.4mmol of Compound 2c, 0.015mmol of Methyl Blue (MB) was added to a two-necked flask, anhydrous methylene chloride was used as a solvent, and after stirring, the flask was placed in an ice bath, and white light (LED 150W) was irradiated over the flask while strongly bubbling with air for 2.5 hours. After the reaction, silica gel column chromatography purification was performed to obtain orange solid compound 2.
(4) Will be 4.5mmol K 2 CO 3 Dissolving in 10ml DMF, adding 0.3mmol of compound 1 and 0.4mmol of compound 2, stirring, reacting for 24h, and purifying by silica gel column chromatography to obtain compound 3, namely the chemofluorescent probe.
[ application example ]
(1) Sensitive detection of peroxynitrite
Firstly, preparing 1mmol/L of the chemiluminescent probe aqueous solution prepared in the example 1, then reacting sodium nitrite and hydrogen peroxide in a dilute hydrochloric acid medium to obtain a peroxynitrite solution containing 1 mu mol/L of ONOO-free radicals, adding the peroxynitrite solution into the probe solution, and detecting the maximum absorption wavelength, the maximum emission wavelength and the Stokes shift before and after the adding, wherein the test results are shown in Table 1:
TABLE 1 test results
From the above test results, it can be seen that the maximum absorption wavelength, the maximum emission wavelength, and the Stokes shift of the solution, in particular, the Stokes shift was changed from 41nm to 98nm, by adding peroxynitrite to the aqueous solution of the chemiluminescent probe prepared in example 1. The larger the Stokes shift, the smaller the energy absorption, the smaller the overlapping of the two peaks, the smaller the interference and the higher the accuracy.
Meanwhile, the change of fluorescence flux before and after the peroxynitrite solution is added is recorded, wherein the initial fluorescence flux phi=0.03 of the solution, and after the peroxynitrite solution is added, the fluorescence flux of the solution is increased by 20-30 times within 10-30min, which indicates that the fluorescence detection intensity of the chemical fluorescence probe provided by the invention on peroxynitrite is high.
(2) Relationship between substance concentration and fluorescence intensity
Aqueous solutions of chemiluminescent probes were prepared at different concentrations according to the data in Table 2, and peroxynitrite solutions containing 1. Mu. Mol/L ONOO-radicals were added, respectively, and the fluorescence intensity was measured under 365nm ultraviolet light and the standard intensity (F/F) was recorded 0 ) Wherein F 0 The fluorescence intensity before the peroxynitrite is added, and F is the fluorescence intensity 30min after the peroxynitrite is added. The results are shown in Table 2:
TABLE 2 relationship between substance concentration and fluorescence intensity
Concentration (mu mol/L) 0 5 10 15 20 25 30
Standard intensity (F/F) 0 ) 0.95 1.46 1.92 2.48 3.02 3.39 3.92
The test data in Table 2 are plotted as a function, as shown in FIG. 1, and it can be seen that the fluorescence intensity of the chemiluminescent probe aqueous solution at a concentration is linearly and positively correlated with the probe concentration.
(3) Detection sensitivity test:
the chemiluminescent probe solutions (final concentration: 1. Mu. Mol/L) were added to peroxynitrite solutions (final concentrations: 5, 10, 25, 50, 100, 250 nmol/L) of different ONO-concentrations, respectively, to react, and the fluorescence spectra of the reacted solutions were measured. The results show that the chemiluminescent probes generate a change of a turn on type fluorescent signal during the ONO-reaction (within the range of 5-250 nmol/L) with different concentrations, which shows that the fluorescent detection sensitivity is high and the application range is wide.
(4) Fluorescence selectivity test:
adding the following anionic compounds which are common in nature or human body and comprise H into 1mmol/L chemiluminescent probe aqueous solution respectively 2 S、KCl、NaI、MgSO 4 、KNO 3 、NaNO 2 、Na 2 CO 3 、NaHCO 3 NaOAc, and commonly active small molecules, including aqueous solutions of glutathione, cysteine, glutamic acid, proline, serine, 5-aminolevulinic acid, arginase (1 μmol/L), found that the fluorescence emission intensity of these solution samples was not significantly changed compared to that of the fluorescence probe alone (Φ=0.03), indicating that the fluorescence probe was highly responsive and selective to ONOO-only.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and additions may be made to those skilled in the art without departing from the method of the present invention, which modifications and additions are also to be considered as within the scope of the present invention.

Claims (8)

1. A chemiluminescent probe based on adamantene-1, 2-dioxetane, wherein the chemiluminescent probe has a molecular structural expression as follows:
2. a method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane, comprising the steps of:
s1, dissolving 2- (4-nitrophenyl) -2-oxo acetic acid and 2- (7-aza-benzotriazol) -N, N, N ', N' -tetramethyl urea hexafluorophosphate in anhydrous dichloromethane, then adding N, N-diisopropylethylamine, stirring at room temperature for 10-30min, finally adding 4-amino benzyl alcohol, and stirring at room temperature for reacting for 12-24h; after the reaction, methylene chloride was added to dilute the reaction solution, which was washed several times with saturated brine, and anhydrous NaSO 4 Drying, performing silica gel column chromatography, and purifying to obtain a compound 1;
s2, adding the compound 2a, the compound 2b and piperidine into a flask, and then adding acetonitrile as a solvent; placing the reaction solution in an oil bath at 90-120 ℃ for heat preservation reaction for 1-5h, and purifying by silica gel column chromatography to obtain a compound 2c;
s3, adding the compound 2c and methyl blue into a double-neck flask, taking anhydrous dichloromethane as a solvent, stirring, placing the flask in an ice bath, irradiating white light above the flask, and simultaneously, strongly foaming for 2-4 hours by using air; after the reaction is finished, purifying by silica gel column chromatography to obtain an orange solid compound 2;
s4, dissolving potassium carbonate in N, N-dimethylformamide, adding the compound 1 and the compound 2, stirring and reacting for 10-36h, and purifying by silica gel column chromatography to obtain the compound 3, namely the chemiluminescent probe.
3. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of claim 2 wherein the molar ratio of 2- (4-nitrophenyl) -2-oxoacetic acid, 4-aminobenzyl alcohol, 2- (7-azabenzotriazol) -N, N, N ', N' -tetramethylurea hexafluorophosphate, N, N-diisopropylethylamine in step S1 is 1 (1-1.5): 1-2): 20-50.
4. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of claim 2 wherein the molar ratio of compound 2a, compound 2b and piperidine in step S2 is 1 (0.8-1.2): 2-3.
5. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of any one of claims 2-4 wherein the amount of methyl blue used in step S3 is 1-10% of the molar amount of compound 2c.
6. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of claim 5 wherein in step S3 the white light is 150-300W LED light.
7. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of any one of claims 2-4 wherein the molar ratio of compound 1 to compound 2 in step S4 is 1 (1-1.5).
8. The method for preparing a chemiluminescent probe based on adamantene-1, 2-dioxetane of claim 7 wherein the amount of potassium carbonate used in step S4 is 10-20 times the amount of compound 1 by mole.
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