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苯并间二氧杂环戊烯类

中文名称 英文名称 CAS号 化学式 结构式图片
—— [(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-yl]-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]methanone —— C33H34N2O8
[(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-yl]-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]methanone
—— (2S,3R,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-(2-methoxyethyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C21H29NO7
(2S,3R,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-(2-methoxyethyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— [(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-yl]-(1,4,7,10-tetraoxa-13-azacyclopentadec-13-yl)methanone —— C28H41NO10
[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-yl]-(1,4,7,10-tetraoxa-13-azacyclopentadec-13-yl)methanone
—— (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-[3-(2-oxopyrrolidin-1-yl)propyl]-3,4-dihydro-2H-pyran-6-carboxamide —— C25H34N2O7
(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-[3-(2-oxopyrrolidin-1-yl)propyl]-3,4-dihydro-2H-pyran-6-carboxamide
—— [(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-3,4-dihydro-2H-pyran-6-yl]-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]methanone —— C33H42N2O10
[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-3,4-dihydro-2H-pyran-6-yl]-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]methanone
—— (2S,4S)-4-(1,3-benzodioxol-5-yl)-2-(3-hydroxypropoxy)-N-(1H-imidazol-2-ylmethyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C20H23N3O6
(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-(3-hydroxypropoxy)-N-(1H-imidazol-2-ylmethyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— [(2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone —— C28H40N2O6
[(2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone
—— [(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-hydroxybutoxy)-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone —— C27H38N2O6
[(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-hydroxybutoxy)-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone
—— 3-[1-[(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-carbonyl]piperidin-4-yl]-1H-benzimidazol-2-one —— C33H33N3O7
3-[1-[(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-carbonyl]piperidin-4-yl]-1H-benzimidazol-2-one
—— (2R,4R)-4-(1,3-benzodioxol-5-yl)-2-(4-hydroxybutoxy)-N-[2-[(5-nitropyridin-2-yl)amino]ethyl]-3,4-dihydro-2H-pyran-6-carboxamide —— C24H28N4O8
(2R,4R)-4-(1,3-benzodioxol-5-yl)-2-(4-hydroxybutoxy)-N-[2-[(5-nitropyridin-2-yl)amino]ethyl]-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-N-(2-hydroxyphenyl)-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C24H27NO7
(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-N-(2-hydroxyphenyl)-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— (2S,4S)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-(hydroxymethyl)benzyloxy)-3,4-dihydro-2H-pyran-6-carboxylic acid —— C21H20O7
(2S,4S)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-(hydroxymethyl)benzyloxy)-3,4-dihydro-2H-pyran-6-carboxylic acid
—— (2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[2-(2-hydroxyethoxy)ethoxy]-N-[2-(1H-imidazol-5-yl)ethyl]-3,4-dihydro-2H-pyran-6-carboxamide —— C22H27N3O7
(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[2-(2-hydroxyethoxy)ethoxy]-N-[2-(1H-imidazol-5-yl)ethyl]-3,4-dihydro-2H-pyran-6-carboxamide
—— [(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone —— C31H38N2O6
[(2S,4S)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-3,4-dihydro-2H-pyran-6-yl]-(4-piperidin-1-ylpiperidin-1-yl)methanone
—— (2S,4S)-4-(1,3-benzodioxol-5-yl)-N-(2,2-dimethoxyethyl)-2-(4-hydroxybutoxy)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide —— C22H31NO8
(2S,4S)-4-(1,3-benzodioxol-5-yl)-N-(2,2-dimethoxyethyl)-2-(4-hydroxybutoxy)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,4R)-4-(1,3-benzodioxol-5-yl)-N-benzyl-2-[2-(2-hydroxyethoxy)ethoxy]-3,4-dihydro-2H-pyran-6-carboxamide —— C24H27NO7
(2R,4R)-4-(1,3-benzodioxol-5-yl)-N-benzyl-2-[2-(2-hydroxyethoxy)ethoxy]-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,4R)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-N-(2-hydroxyphenyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C27H25NO7
(2R,4R)-4-(1,3-benzodioxol-5-yl)-2-[[4-(hydroxymethyl)phenyl]methoxy]-N-(2-hydroxyphenyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,4R)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-hydroxybutoxy)-3,4-dihydro-2H-pyran-6-carboxylic acid —— C17H20O7
(2R,4R)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-hydroxybutoxy)-3,4-dihydro-2H-pyran-6-carboxylic acid
—— (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-N-(2,2-dimethoxyethyl)-2-ethoxy-3-(3-hydroxypropyl)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide —— C23H33NO8
(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-N-(2,2-dimethoxyethyl)-2-ethoxy-3-(3-hydroxypropyl)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,4R)-N-(1H-benzimidazol-2-ylmethyl)-4-(1,3-benzodioxol-5-yl)-2-[2-(2-hydroxyethoxy)ethoxy]-3,4-dihydro-2H-pyran-6-carboxamide —— C25H27N3O7
(2R,4R)-N-(1H-benzimidazol-2-ylmethyl)-4-(1,3-benzodioxol-5-yl)-2-[2-(2-hydroxyethoxy)ethoxy]-3,4-dihydro-2H-pyran-6-carboxamide
—— (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-N-[3-(2-oxopyrrolidin-1-yl)propyl]-3,4-dihydro-2H-pyran-6-carboxamide —— C28H40N2O9
(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-N-[3-(2-oxopyrrolidin-1-yl)propyl]-3,4-dihydro-2H-pyran-6-carboxamide
—— (2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-N-cyclohexyl-2-ethoxy-3-(3-hydroxypropyl)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide —— C25H35NO6
(2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-N-cyclohexyl-2-ethoxy-3-(3-hydroxypropyl)-N-methyl-3,4-dihydro-2H-pyran-6-carboxamide
—— (2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-(2-methoxyethyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C21H29NO7
(2S,3S,4R)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-N-(2-methoxyethyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— 3-[1-[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carbonyl]piperidin-4-yl]-1H-benzimidazol-2-one —— C30H35N3O7
3-[1-[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carbonyl]piperidin-4-yl]-1H-benzimidazol-2-one
—— (2R,3R,4S)-N-(1H-benzimidazol-2-ylmethyl)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carboxamide —— C26H29N3O6
(2R,3R,4S)-N-(1H-benzimidazol-2-ylmethyl)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-(3-hydroxypropyl)-3,4-dihydro-2H-pyran-6-carboxamide
—— (4R,6R)-4-benzo[1,3]dioxol-5-yl-6-(4-hydroxymethyl-benzyloxy)-5,6-dihydro-4H-pyran-2-carboxylic acid allyl ester 391244-17-0 C24H24O7
(4R,6R)-4-benzo[1,3]dioxol-5-yl-6-(4-hydroxymethyl-benzyloxy)-5,6-dihydro-4H-pyran-2-carboxylic acid allyl ester
—— azocan-1-yl-[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-3,4-dihydro-2H-pyran-6-yl]methanone —— C28H41NO8
azocan-1-yl-[(2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-3,4-dihydro-2H-pyran-6-yl]methanone
—— ((2R,4R)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-(hydroxymethyl)benzyloxy)-3,4-dihydro-2H-pyran-6-yl)(morpholino)methanone —— C25H27NO7
((2R,4R)-4-(benzo[d][1,3]dioxol-5-yl)-2-(4-(hydroxymethyl)benzyloxy)-3,4-dihydro-2H-pyran-6-yl)(morpholino)methanone
—— [2-[2-(3-ethyl-4,5-dihydro-1,2-oxazol-5-yl)ethyl]-8-[2-(2-methoxyphenyl)ethylcarbamoyloxymethyl]-1,7-dioxaspiro[5.5]undecan-4-yl] N-(1,3-benzodioxol-4-ylmethyl)carbamate —— C36H47N3O10
[2-[2-(3-ethyl-4,5-dihydro-1,2-oxazol-5-yl)ethyl]-8-[2-(2-methoxyphenyl)ethylcarbamoyloxymethyl]-1,7-dioxaspiro[5.5]undecan-4-yl] N-(1,3-benzodioxol-4-ylmethyl)carbamate
—— N-(1,3-benzodioxol-5-ylmethyl)-1-[(6-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)sulfonyl]piperidine-3-carboxamide —— C19H22N4O7S
N-(1,3-benzodioxol-5-ylmethyl)-1-[(6-methyl-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)sulfonyl]piperidine-3-carboxamide
—— Ethyl 2-[[5-(1,3-benzodioxol-5-yl)-1,2-oxazole-3-carbonyl]amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate —— C22H20N2O6S
Ethyl 2-[[5-(1,3-benzodioxol-5-yl)-1,2-oxazole-3-carbonyl]amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate
—— 1-[5-(2H-1,3-Benzodioxol-5-YL)-1,2-oxazole-3-carbonyl]-2,6-dimethylpiperidine —— C18H20N2O4
1-[5-(2H-1,3-Benzodioxol-5-YL)-1,2-oxazole-3-carbonyl]-2,6-dimethylpiperidine
—— 5-(1,3-Benzodioxol-5-ylmethylidene)-3-(4-ethoxyphenyl)-2-(3-nitrophenyl)-1,1-dioxo-1,3-thiazolidin-4-one —— C25H20N2O8S
5-(1,3-Benzodioxol-5-ylmethylidene)-3-(4-ethoxyphenyl)-2-(3-nitrophenyl)-1,1-dioxo-1,3-thiazolidin-4-one
—— 4-(1,3-Benzodioxol-5-ylmethylidene)-2-[4-(4-chlorophenyl)-1,3-thiazol-2-yl]-5-methylpyrazol-3-one —— C21H14ClN3O3S
4-(1,3-Benzodioxol-5-ylmethylidene)-2-[4-(4-chlorophenyl)-1,3-thiazol-2-yl]-5-methylpyrazol-3-one
—— 4-(1,3-Benzodioxol-5-ylmethylidene)-2-[4-(4-fluorophenyl)-1,3-thiazol-2-yl]-5-methylpyrazol-3-one —— C21H14FN3O3S
4-(1,3-Benzodioxol-5-ylmethylidene)-2-[4-(4-fluorophenyl)-1,3-thiazol-2-yl]-5-methylpyrazol-3-one
—— Methyl 2-amino-4-(1,3-benzodioxol-5-yl)-5-oxo-7-phenyl-4,6,7,8-tetrahydrochromene-3-carboxylate —— C24H21NO6
Methyl 2-amino-4-(1,3-benzodioxol-5-yl)-5-oxo-7-phenyl-4,6,7,8-tetrahydrochromene-3-carboxylate
—— (6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-ethoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide —— C29H29N3O6S
(6S)-3-(1,3-benzodioxol-5-ylmethyl)-N-(4-ethoxyphenyl)-2-(4-ethoxyphenyl)imino-4-oxo-1,3-thiazinane-6-carboxamide
—— (2S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2R)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide —— C24H22N6O6S3
(2S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2R)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide
—— 2-[[5-(1,3-benzodioxol-5-yl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-[(3S)-1,1-dioxothiolan-3-yl]-N-ethylacetamide —— C17H19N3O6S2
2-[[5-(1,3-benzodioxol-5-yl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-[(3S)-1,1-dioxothiolan-3-yl]-N-ethylacetamide
—— (2R)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2R)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide —— C24H22N6O6S3
(2R)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2R)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide
—— (2S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2S)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide —— C24H22N6O6S3
(2S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-2-[[5-[(2S)-1-[(2Z)-2-(1,3-benzodioxol-5-ylmethylidene)hydrazinyl]-1-oxopropan-2-yl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]propanamide
—— ethyl (2Z,5S)-2-[(6-chloro-1,3-benzodioxol-5-yl)methylidene]-7-methyl-5-(4-methylsulfanylphenyl)-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C25H21ClN2O5S2
ethyl (2Z,5S)-2-[(6-chloro-1,3-benzodioxol-5-yl)methylidene]-7-methyl-5-(4-methylsulfanylphenyl)-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2Z,5R)-2-[(6-chloro-1,3-benzodioxol-5-yl)methylidene]-7-methyl-5-(4-methylsulfanylphenyl)-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C25H21ClN2O5S2
ethyl (2Z,5R)-2-[(6-chloro-1,3-benzodioxol-5-yl)methylidene]-7-methyl-5-(4-methylsulfanylphenyl)-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (E)-2-amino-3-[(6-nitro-1,3-benzodioxol-5-yl)methylideneamino]but-2-enedinitrile —— C12H7N5O4
(E)-2-amino-3-[(6-nitro-1,3-benzodioxol-5-yl)methylideneamino]but-2-enedinitrile
—— (4S)-4-[(R)-1,3-benzodioxol-5-yl-(4-methylpiperazin-1-yl)methyl]-5-methyl-2-phenyl-4H-pyrazol-3-one —— C23H26N4O3
(4S)-4-[(R)-1,3-benzodioxol-5-yl-(4-methylpiperazin-1-yl)methyl]-5-methyl-2-phenyl-4H-pyrazol-3-one
—— (4R)-4-[(S)-1,3-benzodioxol-5-yl-(4-methylpiperazin-1-yl)methyl]-5-methyl-2-phenyl-4H-pyrazol-3-one —— C23H26N4O3
(4R)-4-[(S)-1,3-benzodioxol-5-yl-(4-methylpiperazin-1-yl)methyl]-5-methyl-2-phenyl-4H-pyrazol-3-one
—— (1S,3S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxamide —— C16H16Cl2N2O3
(1S,3S)-N-[(Z)-1,3-benzodioxol-5-ylmethylideneamino]-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropane-1-carboxamide
—— (2R,3R,5S,6S)-2,6-bis(1,3-benzodioxol-5-yl)-4,4-dimethyl-3,5-dinitropiperidine —— C21H21N3O8
(2R,3R,5S,6S)-2,6-bis(1,3-benzodioxol-5-yl)-4,4-dimethyl-3,5-dinitropiperidine
—— (1S,5S)-3-[4-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]butyl]-1,8,8-trimethyl-3-azabicyclo[3.2.1]octane-2,4-dione —— C26H37N3O4
(1S,5S)-3-[4-[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]butyl]-1,8,8-trimethyl-3-azabicyclo[3.2.1]octane-2,4-dione
—— (4R)-4-[1,3-benzodioxol-5-yl-[(4S)-1-(4-chlorophenyl)-3-methyl-5-oxo-4H-pyrazol-4-yl]methyl]-2-(4-chlorophenyl)-5-methyl-4H-pyrazol-3-one —— C28H22Cl2N4O4
(4R)-4-[1,3-benzodioxol-5-yl-[(4S)-1-(4-chlorophenyl)-3-methyl-5-oxo-4H-pyrazol-4-yl]methyl]-2-(4-chlorophenyl)-5-methyl-4H-pyrazol-3-one