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中文名称 英文名称 CAS号 化学式 结构式图片
—— 5-(4-methylbenzyl)-2-ethyl-2,5-dihydropyrazolo[3,4-d]-pyrimidin-4-one 402570-75-6 C15H16N4O
5-(4-methylbenzyl)-2-ethyl-2,5-dihydropyrazolo[3,4-d]-pyrimidin-4-one
—— 5-(2,4,6-trimethylbenzyl)-2,5-dihydropyrazolo[3,4-d]-pyrimidin-4-one 402570-48-3 C15H16N4O
5-(2,4,6-trimethylbenzyl)-2,5-dihydropyrazolo[3,4-d]-pyrimidin-4-one
—— 5-(2-chlorophenoxymethyl)-4,5,6,7-tetrahydro-1H-benzimidazole —— C14H15ClN2O
5-(2-chlorophenoxymethyl)-4,5,6,7-tetrahydro-1H-benzimidazole
—— 5-(2,6-difluorophenoxymethyl)-4,5,6,7-tetrahydro-1H-benzimidazole —— C14H14F2N2O
5-(2,6-difluorophenoxymethyl)-4,5,6,7-tetrahydro-1H-benzimidazole
—— 5-hydroxy-3-(1-methylpiperidin-4-yl)-3,4-dihydro-2H-isoquinolin-1-one 476492-07-6 C15H20N2O2
5-hydroxy-3-(1-methylpiperidin-4-yl)-3,4-dihydro-2H-isoquinolin-1-one
—— 5-chloro-1-methyl-3,4-dihydro-2H-pyrrol-1-ium —— C5H9ClN+
5-chloro-1-methyl-3,4-dihydro-2H-pyrrol-1-ium
—— 5-(1-naphthalen-1-ylethylsulfanyl)-1H-1,2,4-triazole —— C14H13N3S
5-(1-naphthalen-1-ylethylsulfanyl)-1H-1,2,4-triazole
—— 5-chloro-4-cyanoacetyl-1-methyl-3-trifluoromethylpyrazole —— C8H5ClF3N3O
5-chloro-4-cyanoacetyl-1-methyl-3-trifluoromethylpyrazole
—— 5-benzyl-2-methyl-2,5-dihydropyrazolo[3,4-d]pyrimidin-4-one 402570-52-9 C13H12N4O
5-benzyl-2-methyl-2,5-dihydropyrazolo[3,4-d]pyrimidin-4-one
—— (5Z)-1-methyl-5-[(2E)-2-(3-methyl-1,3-thiazolidin-2-ylidene)ethylidene]-2-sulfanylideneimidazolidin-4-one —— C10H13N3OS2
(5Z)-1-methyl-5-[(2E)-2-(3-methyl-1,3-thiazolidin-2-ylidene)ethylidene]-2-sulfanylideneimidazolidin-4-one
—— 5-(3-fluoropyridin-2-yl)-4H-thieno[3,2-b]pyridin-7-one —— C12H7FN2OS
5-(3-fluoropyridin-2-yl)-4H-thieno[3,2-b]pyridin-7-one
—— 5-[4-[(2R,5S)-2,5-dimethyl-2,5-dihydropyrrol-1-yl]butyl]-1H-imidazole —— C13H21N3
5-[4-[(2R,5S)-2,5-dimethyl-2,5-dihydropyrrol-1-yl]butyl]-1H-imidazole
—— 5-chloro-2-methylsulfinyl-2,3-dihydro-1H-inden-1-ol —— C10H11ClO2S
5-chloro-2-methylsulfinyl-2,3-dihydro-1H-inden-1-ol
—— (5-Methyl-3-phenacyl-1,3-thiazol-3-ium-4-yl)methanolate —— C13H13NO2S
(5-Methyl-3-phenacyl-1,3-thiazol-3-ium-4-yl)methanolate
—— 5,6-Dimethyl-5,7,14-triazapentacyclo[10.3.1.01,12.02,10.04,8]hexadeca-2,4(8),6,9-tetraene —— C15H17N3
5,6-Dimethyl-5,7,14-triazapentacyclo[10.3.1.01,12.02,10.04,8]hexadeca-2,4(8),6,9-tetraene
—— 5-[5-[(3R)-pyrrolidin-3-yl]oxypyridin-3-yl]pyrimidine —— C13H14N4O
5-[5-[(3R)-pyrrolidin-3-yl]oxypyridin-3-yl]pyrimidine
—— 5-N-butyl-2-N-hydroxythiophene-2,5-dicarboxamide —— C10H14N2O3S
5-N-butyl-2-N-hydroxythiophene-2,5-dicarboxamide
—— 5-Methyl-3-(methylamino)heptanoic acid —— C9H19NO2
5-Methyl-3-(methylamino)heptanoic acid
—— (5-propoxy-1H-indol-3-yl)methanol —— C12H15NO2
(5-propoxy-1H-indol-3-yl)methanol
—— 5-hex-1-ynyl-3-methyl-1H-pyrimidine-2,4-dione —— C11H14N2O2
5-hex-1-ynyl-3-methyl-1H-pyrimidine-2,4-dione
—— (5Z)-3-[(2E,20E,24E)-31-(4-amino-3,5-dihydroxy-6-methyloxan-2-yl)oxy-5,7,11,13,17,19,26,27,29,35,37,41,43-tridecahydroxy-2,10,12,18,20,22,24,32,40,42,44-undecamethyl-23-oxopentatetraconta-2,20,24-trienoyl]-1-methyl-5-(2-methylpropylidene)pyrrolidine-2,4-dione —— C71H126N2O21
(5Z)-3-[(2E,20E,24E)-31-(4-amino-3,5-dihydroxy-6-methyloxan-2-yl)oxy-5,7,11,13,17,19,26,27,29,35,37,41,43-tridecahydroxy-2,10,12,18,20,22,24,32,40,42,44-undecamethyl-23-oxopentatetraconta-2,20,24-trienoyl]-1-methyl-5-(2-methylpropylidene)pyrrolidine-2,4-dione
—— [5-[2-[3-(3-Amino-1-hydroxy-3-oxopropyl)-11,20,25-trihydroxy-15-(1-hydroxyethyl)-18-[[4-[5-[4-(7-methoxyheptoxy)phenyl]-1,3,4-thiadiazol-2-yl]benzoyl]amino]-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-2-hydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate —— C58H76N10O21S2
[5-[2-[3-(3-Amino-1-hydroxy-3-oxopropyl)-11,20,25-trihydroxy-15-(1-hydroxyethyl)-18-[[4-[5-[4-(7-methoxyheptoxy)phenyl]-1,3,4-thiadiazol-2-yl]benzoyl]amino]-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-2-hydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate
—— [5-[(1S,2S)-2-[(3S,6S,9S,11R,15S,18S,20R,21R,24S,25S,26S)-3-[(1R)-3-amino-1-hydroxy-3-oxopropyl]-18-(10,12-dimethyltetradecanoylamino)-11,20,21,25-tetrahydroxy-15-[(1R)-1-hydroxyethyl]-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate —— C51H82N8O21S
[5-[(1S,2S)-2-[(3S,6S,9S,11R,15S,18S,20R,21R,24S,25S,26S)-3-[(1R)-3-amino-1-hydroxy-3-oxopropyl]-18-(10,12-dimethyltetradecanoylamino)-11,20,21,25-tetrahydroxy-15-[(1R)-1-hydroxyethyl]-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate
—— [5-[2-[3-(3-Amino-1-hydroxy-3-oxopropyl)-18-[[4-[5-(4-butoxyphenyl)-1,3,4-thiadiazol-2-yl]benzoyl]amino]-11,20,21,25-tetrahydroxy-15-(1-hydroxyethyl)-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate —— C54H68N10O22S2
[5-[2-[3-(3-Amino-1-hydroxy-3-oxopropyl)-18-[[4-[5-(4-butoxyphenyl)-1,3,4-thiadiazol-2-yl]benzoyl]amino]-11,20,21,25-tetrahydroxy-15-(1-hydroxyethyl)-26-methyl-2,5,8,14,17,23-hexaoxo-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate
—— [5-[(1S,2S)-2-[(11R,18S,20R,25S,26S)-3-[(1R)-3-amino-1-hydroxy-3-oxopropyl]-11,20,25-trihydroxy-15-[(1R)-1-hydroxyethyl]-26-methyl-2,5,8,14,17,23-hexaoxo-18-[3-[4-(4-pentylphenyl)phenyl]propanoylamino]-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate —— C55H74N8O20S
[5-[(1S,2S)-2-[(11R,18S,20R,25S,26S)-3-[(1R)-3-amino-1-hydroxy-3-oxopropyl]-11,20,25-trihydroxy-15-[(1R)-1-hydroxyethyl]-26-methyl-2,5,8,14,17,23-hexaoxo-18-[3-[4-(4-pentylphenyl)phenyl]propanoylamino]-1,4,7,13,16,22-hexazatricyclo[22.3.0.09,13]heptacosan-6-yl]-1,2-dihydroxyethyl]-2-hydroxyphenyl] hydrogen sulfate
—— (5R,9S)-2-[3-[2-[[6-[[6-[4-[1-[2-(2,4-difluorophenyl)-2-hydroxy-3-(1,2,4-triazol-1-yl)propyl]-1,2,4-triazol-3-yl]butylamino]-6-oxohexyl]amino]-6-oxohexyl]amino]-2-oxoethyl]sulfanylpropoxymethyl]-9-formyl-5-methyl-13-propan-2-yltetracyclo[7.4.0.02,11.04,8]tridec-12-ene-1-carboxylic acid —— C54H77F2N9O8S
(5R,9S)-2-[3-[2-[[6-[[6-[4-[1-[2-(2,4-difluorophenyl)-2-hydroxy-3-(1,2,4-triazol-1-yl)propyl]-1,2,4-triazol-3-yl]butylamino]-6-oxohexyl]amino]-6-oxohexyl]amino]-2-oxoethyl]sulfanylpropoxymethyl]-9-formyl-5-methyl-13-propan-2-yltetracyclo[7.4.0.02,11.04,8]tridec-12-ene-1-carboxylic acid
—— 5-(1,3-dioxobenzo[de]isoquinolin-2-yl)-1-N,3-N-bis[2-[2-(1,3-dioxobenzo[de]isoquinolin-2-yl)ethylamino]ethyl]-3-N-methylbenzene-1,3-dicarboxamide —— C53H43N7O8
5-(1,3-dioxobenzo[de]isoquinolin-2-yl)-1-N,3-N-bis[2-[2-(1,3-dioxobenzo[de]isoquinolin-2-yl)ethylamino]ethyl]-3-N-methylbenzene-1,3-dicarboxamide
—— 5-chloro-N-[2-[4-(cyclohexylcarbamoylsulfamoyl)phenyl]ethyl]-2-methoxybenzamide;5-[[4-[(6-hydroxy-2,5,7,8-tetramethyl-3,4-dihydrochromen-2-yl)methoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione —— C47H55ClN4O10S2
5-chloro-N-[2-[4-(cyclohexylcarbamoylsulfamoyl)phenyl]ethyl]-2-methoxybenzamide;5-[[4-[(6-hydroxy-2,5,7,8-tetramethyl-3,4-dihydrochromen-2-yl)methoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione
—— 5-ROX-CF —— C55H44N3O11
5-ROX-CF
—— 5-chloro-N-[2-[4-(cyclohexylcarbamoylsulfamoyl)phenyl]ethyl]-2-methoxybenzamide;5-[[4-[2-[methyl(pyridin-2-yl)amino]ethoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione —— C41H47ClN6O8S2
5-chloro-N-[2-[4-(cyclohexylcarbamoylsulfamoyl)phenyl]ethyl]-2-methoxybenzamide;5-[[4-[2-[methyl(pyridin-2-yl)amino]ethoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione
—— 5-[2-[4-[2-[2-[2-[4-[2-[[4-Cyano-4-(3,4-dimethoxyphenyl)-5-methylhexyl]-methylamino]ethyl]-2-methoxyphenoxy]ethoxy]ethoxy]ethoxy]-3-methoxyphenyl]ethyl-methylamino]-2-(3,4-dimethoxyphenyl)-2-propan-2-ylpentanenitrile —— C58H82N4O10
5-[2-[4-[2-[2-[2-[4-[2-[[4-Cyano-4-(3,4-dimethoxyphenyl)-5-methylhexyl]-methylamino]ethyl]-2-methoxyphenoxy]ethoxy]ethoxy]ethoxy]-3-methoxyphenyl]ethyl-methylamino]-2-(3,4-dimethoxyphenyl)-2-propan-2-ylpentanenitrile
—— 5-amino-1-cyclopropyl-7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-6,8-difluoro-4-oxoquinoline-3-carboxylic acid;(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-5-(diaminomethylideneamino)-N-naphthalen-2-ylpentanamide —— C44H52F2N10O5
5-amino-1-cyclopropyl-7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-6,8-difluoro-4-oxoquinoline-3-carboxylic acid;(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-5-(diaminomethylideneamino)-N-naphthalen-2-ylpentanamide
—— (5Z)-4-bromo-3-(1-bromohexyl)-5-(bromomethylidene)furan-2-one;3-(1-bromohexyl)-5-(dibromomethylidene)furan-2-one —— C22H26Br6O4
(5Z)-4-bromo-3-(1-bromohexyl)-5-(bromomethylidene)furan-2-one;3-(1-bromohexyl)-5-(dibromomethylidene)furan-2-one
—— [5-(6-Aminopurin-9-yl)-4-[[5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxyoxolan-2-yl]methyl hexadecanoate —— C36H55N10O9PS
[5-(6-Aminopurin-9-yl)-4-[[5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphinothioyl]oxyoxolan-2-yl]methyl hexadecanoate
—— (5S,8S,11S,14R,17S,19aS)-11-(4-Amino-butyl)-8-(3-amino-propyl)-5-benzyl-17-(4-hydroxy-benzyl)-14-(1H-indol-3-ylmethyl)-tetradecahydro-3a,6,9,12,15,18-hexaaza-cyclopentacyclooctadecene-4,7,10,13,16,19-hexaone 137506-30-0 C45H57N9O7
(5S,8S,11S,14R,17S,19aS)-11-(4-Amino-butyl)-8-(3-amino-propyl)-5-benzyl-17-(4-hydroxy-benzyl)-14-(1H-indol-3-ylmethyl)-tetradecahydro-3a,6,9,12,15,18-hexaaza-cyclopentacyclooctadecene-4,7,10,13,16,19-hexaone
—— 5-[[(2S)-2-[[(1S,8R,9R,10S)-10-(1-adamantylmethylcarbamoyl)-3-methoxycarbonyltricyclo[6.2.1.02,7]undeca-2(7),3,5-triene-9-carbonyl]amino]-3-phenylpropanoyl]amino]benzene-1,3-dicarboxylic acid —— C43H45N3O9
5-[[(2S)-2-[[(1S,8R,9R,10S)-10-(1-adamantylmethylcarbamoyl)-3-methoxycarbonyltricyclo[6.2.1.02,7]undeca-2(7),3,5-triene-9-carbonyl]amino]-3-phenylpropanoyl]amino]benzene-1,3-dicarboxylic acid
—— 5-[[4-[5-[[4-[5-[Acetyl(hydroxy)amino]pentylamino]-4-oxobutanoyl]-hydroxyamino]pentylamino]-4-oxobutanoyl]-hydroxyamino]pentylazanium;octane-1-sulfonate —— C33H66N6O11S
5-[[4-[5-[[4-[5-[Acetyl(hydroxy)amino]pentylamino]-4-oxobutanoyl]-hydroxyamino]pentylamino]-4-oxobutanoyl]-hydroxyamino]pentylazanium;octane-1-sulfonate
—— 5-hydroxy-2-[4-methoxy-3-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-7-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxymethyl]oxan-2-yl]oxy-2,3-dihydrochromen-4-one —— C34H44O20
5-hydroxy-2-[4-methoxy-3-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-7-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxymethyl]oxan-2-yl]oxy-2,3-dihydrochromen-4-one
—— 5-O-ethyl 3-O-methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate;3-O-(2-methoxyethyl) 5-O-propan-2-yl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate —— C39H46N4O13
5-O-ethyl 3-O-methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate;3-O-(2-methoxyethyl) 5-O-propan-2-yl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
—— 5-acetamido-2-[2,3-di(tetradecoxy)propoxy]-4-hydroxy-6-[(1R,2S)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid —— C42H81NO11
5-acetamido-2-[2,3-di(tetradecoxy)propoxy]-4-hydroxy-6-[(1R,2S)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid
—— [5-hydroxy-6-methyl-4-[(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]pyridin-3-yl]methyl [(2R)-2,5,7,8-tetramethyl-2-[(4R,8R)-4,8,12-trimethyltridecyl]-3,4-dihydrochromen-6-yl] hydrogen phosphate —— C40H59N2O7PS2
[5-hydroxy-6-methyl-4-[(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]pyridin-3-yl]methyl [(2R)-2,5,7,8-tetramethyl-2-[(4R,8R)-4,8,12-trimethyltridecyl]-3,4-dihydrochromen-6-yl] hydrogen phosphate
—— [5-Chloro-6-ethyl-4-[[4-[4-(trifluoromethylsulfonyloxy)phenyl]cyclohexyl]amino]pyrimidin-1-ium-1-yl]methyl benzoate —— C27H28ClF3N3O5S+
[5-Chloro-6-ethyl-4-[[4-[4-(trifluoromethylsulfonyloxy)phenyl]cyclohexyl]amino]pyrimidin-1-ium-1-yl]methyl benzoate
—— 5,10,15-Tris(1-methylpyridin-1-ium-4-yl)-20-phenyl-2,23-dihydroporphyrin;trichloride —— C44H36Cl3N7
5,10,15-Tris(1-methylpyridin-1-ium-4-yl)-20-phenyl-2,23-dihydroporphyrin;trichloride
—— 5-[2,6-Ditert-butyl-4-[2-[3,5-ditert-butyl-4-(4-carboxybutanoyloxy)phenyl]sulfanylpropan-2-ylsulfanyl]phenoxy]-5-oxopentanoic acid —— C41H60O8S2
5-[2,6-Ditert-butyl-4-[2-[3,5-ditert-butyl-4-(4-carboxybutanoyloxy)phenyl]sulfanylpropan-2-ylsulfanyl]phenoxy]-5-oxopentanoic acid
—— 5,10,15,20-Tetrakis(1-methylpyridin-1-ium-4-yl)-1,20,21,23-tetrahydroporphyrin —— C44H40N8+4
5,10,15,20-Tetrakis(1-methylpyridin-1-ium-4-yl)-1,20,21,23-tetrahydroporphyrin
—— 5-Ethenyl-20-methoxycarbonyl-10,14-bis(3-methoxy-3-oxopropyl)-4,9,15,19-tetramethyl-25,26,27,28-tetrazahexacyclo[16.6.1.13,6.18,11.113,16.019,24]octacosa-1(25),2,4,6,8(27),9,11,13,15,17,21-undecaene-21-carboxylic acid —— C41H44N4O8
5-Ethenyl-20-methoxycarbonyl-10,14-bis(3-methoxy-3-oxopropyl)-4,9,15,19-tetramethyl-25,26,27,28-tetrazahexacyclo[16.6.1.13,6.18,11.113,16.019,24]octacosa-1(25),2,4,6,8(27),9,11,13,15,17,21-undecaene-21-carboxylic acid
—— 5-Isopropyl-pyridine-2-sulfonic acid {5-(2-methoxy-phenoxy)-2-morpholin-4-yl-6-[2-(thiophene-2-sulfonylamino)-ethoxy]-pyrimidin-4-yl}-amide —— C29H34N6O8S3
5-Isopropyl-pyridine-2-sulfonic acid {5-(2-methoxy-phenoxy)-2-morpholin-4-yl-6-[2-(thiophene-2-sulfonylamino)-ethoxy]-pyrimidin-4-yl}-amide
—— 5-[[(2S)-2-[[2-(1-adamantylmethylcarbamoyl)-4-(dimethylamino)benzoyl]amino]-3-phenylpropanoyl]amino]benzene-1,3-dicarboxylic acid —— C38H42N4O7
5-[[(2S)-2-[[2-(1-adamantylmethylcarbamoyl)-4-(dimethylamino)benzoyl]amino]-3-phenylpropanoyl]amino]benzene-1,3-dicarboxylic acid
—— [5-[[hydroxy(2-quinolin-1-ium-1-ylethoxy)phosphoryl]oxymethyl]oxolan-2-yl]methyl N-octadecylcarbamate —— C36H60N2O7P+
[5-[[hydroxy(2-quinolin-1-ium-1-ylethoxy)phosphoryl]oxymethyl]oxolan-2-yl]methyl N-octadecylcarbamate
—— 5-[2-ethoxy-5-[4-[(2-methoxyphenyl)methyl]piperazin-1-yl]sulfonylpyridin-3-yl]-3-propyl-2-(pyridin-2-ylmethyl)-6H-pyrazolo[4,3-d]pyrimidin-7-one —— C33H38N8O5S
5-[2-ethoxy-5-[4-[(2-methoxyphenyl)methyl]piperazin-1-yl]sulfonylpyridin-3-yl]-3-propyl-2-(pyridin-2-ylmethyl)-6H-pyrazolo[4,3-d]pyrimidin-7-one