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吡咯烷类

中文名称 英文名称 CAS号 化学式 结构式图片
—— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C36H38N2O7S
(4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— (4Z)-5-(4-bromophenyl)-1-[2-(dimethylamino)ethyl]-4-[hydroxy-(4-propan-2-yloxyphenyl)methylidene]pyrrolidine-2,3-dione —— C24H27BrN2O4
(4Z)-5-(4-bromophenyl)-1-[2-(dimethylamino)ethyl]-4-[hydroxy-(4-propan-2-yloxyphenyl)methylidene]pyrrolidine-2,3-dione
—— (4E)-5-(4-butoxyphenyl)-1-[3-(diethylamino)propyl]-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]pyrrolidine-2,3-dione —— C30H38N2O6
(4E)-5-(4-butoxyphenyl)-1-[3-(diethylamino)propyl]-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]pyrrolidine-2,3-dione
—— (4E)-5-(3,4-dimethoxyphenyl)-4-[hydroxy-[4-[(3-methylphenyl)methoxy]phenyl]methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione —— C33H30N2O6
(4E)-5-(3,4-dimethoxyphenyl)-4-[hydroxy-[4-[(3-methylphenyl)methoxy]phenyl]methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione
—— (4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C34H34N2O8S
(4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
—— 4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-3-hydroxy-5-(3-hydroxyphenyl)-1-(pyridin-3-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one —— C25H20N2O6
4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-3-hydroxy-5-(3-hydroxyphenyl)-1-(pyridin-3-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one
—— 5-(3,4-dimethoxyphenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-({4-[(3-methylbenzyl)oxy]phenyl}carbonyl)-1,5-dihydro-2H-pyrrol-2-one —— C31H34N2O6
5-(3,4-dimethoxyphenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-({4-[(3-methylbenzyl)oxy]phenyl}carbonyl)-1,5-dihydro-2H-pyrrol-2-one
—— ethyl 2-{(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate —— C33H36N2O8S
ethyl 2-{(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate
—— (4E)-4-[(4-chlorophenyl)(hydroxy)methylidene]-1-hexadecyl-5-(4-nitrophenyl)pyrrolidine-2,3-dione —— C33H43ClN2O5
(4E)-4-[(4-chlorophenyl)(hydroxy)methylidene]-1-hexadecyl-5-(4-nitrophenyl)pyrrolidine-2,3-dione
—— 3-hydroxy-5-(2-methoxyphenyl)-1-[3-(morpholin-4-yl)propyl]-4-{[4-(prop-2-en-1-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one —— C28H32N2O6
3-hydroxy-5-(2-methoxyphenyl)-1-[3-(morpholin-4-yl)propyl]-4-{[4-(prop-2-en-1-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one
—— (4E)-5-(3-chlorophenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-1-{5-[(4-methylbenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}pyrrolidine-2,3-dione —— C30H24ClN3O4S2
(4E)-5-(3-chlorophenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-1-{5-[(4-methylbenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}pyrrolidine-2,3-dione
—— 5-(4-chlorophenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-{[4-(2-methylpropoxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one —— C25H29ClN2O4
5-(4-chlorophenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-{[4-(2-methylpropoxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one
—— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-5-[4-(propan-2-yl)phenyl]pyrrolidine-2,3-dione —— C32H30N2O5S
(4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-5-[4-(propan-2-yl)phenyl]pyrrolidine-2,3-dione
—— 4-({2-(3-bromophenyl)-4-hydroxy-1-[3-(morpholin-4-yl)propyl]-5-oxo-2,5-dihydro-1H-pyrrol-3-yl}carbonyl)-N,N-dimethylbenzenesulfonamide —— C26H30BrN3O6S
4-({2-(3-bromophenyl)-4-hydroxy-1-[3-(morpholin-4-yl)propyl]-5-oxo-2,5-dihydro-1H-pyrrol-3-yl}carbonyl)-N,N-dimethylbenzenesulfonamide
—— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(4-propoxyphenyl)methylidene]-1-(5-methyl-1,2-oxazol-3-yl)pyrrolidine-2,3-dione —— C29H32N2O7
(4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(4-propoxyphenyl)methylidene]-1-(5-methyl-1,2-oxazol-3-yl)pyrrolidine-2,3-dione
—— (4E)-1-hexadecyl-4-[hydroxy(4-methylphenyl)methylidene]-5-(2-nitrophenyl)pyrrolidine-2,3-dione —— C34H46N2O5
(4E)-1-hexadecyl-4-[hydroxy(4-methylphenyl)methylidene]-5-(2-nitrophenyl)pyrrolidine-2,3-dione
—— (4E)-1-[5-(benzylsulfanyl)-1,3,4-thiadiazol-2-yl]-5-(3,4-diethoxyphenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C33H31N3O6S2
(4E)-1-[5-(benzylsulfanyl)-1,3,4-thiadiazol-2-yl]-5-(3,4-diethoxyphenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— 5-(2,4-dimethoxyphenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one —— C26H32N2O6
5-(2,4-dimethoxyphenyl)-1-[2-(dimethylamino)ethyl]-3-hydroxy-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one
—— (4Z)-4-[hydroxy-(4-propan-2-yloxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)-5-(4-nitrophenyl)pyrrolidine-2,3-dione —— C26H29N3O7
(4Z)-4-[hydroxy-(4-propan-2-yloxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)-5-(4-nitrophenyl)pyrrolidine-2,3-dione
—— 5-(4-chlorophenyl)-3-hydroxy-4-{[4-(2-methylpropoxy)phenyl]carbonyl}-1-[2-(morpholin-4-yl)ethyl]-1,5-dihydro-2H-pyrrol-2-one —— C27H31ClN2O5
5-(4-chlorophenyl)-3-hydroxy-4-{[4-(2-methylpropoxy)phenyl]carbonyl}-1-[2-(morpholin-4-yl)ethyl]-1,5-dihydro-2H-pyrrol-2-one
—— prop-2-en-1-yl 2-{(3E)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-2-[4-(methoxycarbonyl)phenyl]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate —— C30H26N2O8S
prop-2-en-1-yl 2-{(3E)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-2-[4-(methoxycarbonyl)phenyl]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate
—— (4E)-1-(6-chloro-1,3-benzothiazol-2-yl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-5-[3-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione —— C31H27ClN2O6S
(4E)-1-(6-chloro-1,3-benzothiazol-2-yl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-5-[3-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione
—— 1-[3-(dimethylamino)propyl]-3-hydroxy-5-(4-hydroxy-3-methoxyphenyl)-4-{[4-(prop-2-en-1-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one —— C26H30N2O6
1-[3-(dimethylamino)propyl]-3-hydroxy-5-(4-hydroxy-3-methoxyphenyl)-4-{[4-(prop-2-en-1-yloxy)phenyl]carbonyl}-1,5-dihydro-2H-pyrrol-2-one
—— 4-{[2-(4-bromophenyl)-4-hydroxy-1-(2-methoxyethyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl]carbonyl}-N,N-dimethylbenzenesulfonamide —— C22H23BrN2O6S
4-{[2-(4-bromophenyl)-4-hydroxy-1-(2-methoxyethyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl]carbonyl}-N,N-dimethylbenzenesulfonamide
—— (4E)-5-[3-(benzyloxy)phenyl]-1-[5-(benzylsulfanyl)-1,3,4-thiadiazol-2-yl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C36H29N3O5S2
(4E)-5-[3-(benzyloxy)phenyl]-1-[5-(benzylsulfanyl)-1,3,4-thiadiazol-2-yl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— 3-hydroxy-1-(3-methoxypropyl)-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-5-(3,4,5-trimethoxyphenyl)-1,5-dihydro-2H-pyrrol-2-one —— C27H33NO8
3-hydroxy-1-(3-methoxypropyl)-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-5-(3,4,5-trimethoxyphenyl)-1,5-dihydro-2H-pyrrol-2-one
—— 1-[2-(diethylamino)ethyl]-5-(3,4-dimethoxyphenyl)-3-hydroxy-4-[(4-propoxyphenyl)carbonyl]-1,5-dihydro-2H-pyrrol-2-one —— C28H36N2O6
1-[2-(diethylamino)ethyl]-5-(3,4-dimethoxyphenyl)-3-hydroxy-4-[(4-propoxyphenyl)carbonyl]-1,5-dihydro-2H-pyrrol-2-one
—— (4E)-5-(3,4-dimethoxyphenyl)-1-hexadecyl-4-[hydroxy(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C36H51NO5
(4E)-5-(3,4-dimethoxyphenyl)-1-hexadecyl-4-[hydroxy(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
—— (6-methylthieno[2,3-b]quinolin-2-yl)-[(3R)-3-phenylpyrrolidin-1-yl]methanone —— C23H20N2OS
(6-methylthieno[2,3-b]quinolin-2-yl)-[(3R)-3-phenylpyrrolidin-1-yl]methanone
—— 5-(2,5-dimethoxyphenyl)-3-hydroxy-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-1-(pyridin-3-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one —— C28H28N2O6
5-(2,5-dimethoxyphenyl)-3-hydroxy-4-{[4-(propan-2-yloxy)phenyl]carbonyl}-1-(pyridin-3-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one
—— 4-(4-butoxybenzoyl)-3-hydroxy-5-(4-hydroxyphenyl)-1-(2-methoxyethyl)-1,5-dihydro-2H-pyrrol-2-one —— C24H27NO6
4-(4-butoxybenzoyl)-3-hydroxy-5-(4-hydroxyphenyl)-1-(2-methoxyethyl)-1,5-dihydro-2H-pyrrol-2-one
—— (E)-[2-(4-fluorophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene][4-(propan-2-yloxy)phenyl]methanolate —— C26H23FN2O4
(E)-[2-(4-fluorophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene][4-(propan-2-yloxy)phenyl]methanolate
—— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-ethoxyphenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C31H28N2O6S
(4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-ethoxyphenyl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— N-(2,5-dimethylphenyl)-2-[[5-[(3R)-1-(4-methylphenyl)-5-oxopyrrolidin-3-yl]-1,3,4-oxadiazol-2-yl]sulfanyl]acetamide —— C23H24N4O3S
N-(2,5-dimethylphenyl)-2-[[5-[(3R)-1-(4-methylphenyl)-5-oxopyrrolidin-3-yl]-1,3,4-oxadiazol-2-yl]sulfanyl]acetamide
—— (3S)-1-(4-chlorophenyl)-N-[2-(3,4-diethoxyphenyl)ethyl]-2-oxopyrrolidine-3-carboxamide —— C23H27ClN2O4
(3S)-1-(4-chlorophenyl)-N-[2-(3,4-diethoxyphenyl)ethyl]-2-oxopyrrolidine-3-carboxamide
—— (3S)-N-(4-fluorophenyl)-2-oxo-1-phenylpyrrolidine-3-carboxamide —— C17H15FN2O2
(3S)-N-(4-fluorophenyl)-2-oxo-1-phenylpyrrolidine-3-carboxamide
—— (4E)-5-[3-(benzyloxy)phenyl]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C36H30N2O6S
(4E)-5-[3-(benzyloxy)phenyl]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— (3S)-2-oxo-1-phenyl-N-[(3,4,5-trimethoxyphenyl)methyl]pyrrolidine-3-carboxamide —— C21H24N2O5
(3S)-2-oxo-1-phenyl-N-[(3,4,5-trimethoxyphenyl)methyl]pyrrolidine-3-carboxamide
—— prop-2-en-1-yl 2-{(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate —— C34H36N2O8S
prop-2-en-1-yl 2-{(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-4,5-dioxopyrrolidin-1-yl}-4-methyl-1,3-thiazole-5-carboxylate
—— 5-(3,4-dimethoxyphenyl)-3-hydroxy-4-({4-[(3-methylbenzyl)oxy]phenyl}carbonyl)-1-(pyridin-4-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one —— C33H30N2O6
5-(3,4-dimethoxyphenyl)-3-hydroxy-4-({4-[(3-methylbenzyl)oxy]phenyl}carbonyl)-1-(pyridin-4-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one
—— (4E)-5-(3-butoxyphenyl)-1-{5-[(4-chlorobenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione —— C33H30ClN3O5S2
(4E)-5-(3-butoxyphenyl)-1-{5-[(4-chlorobenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]pyrrolidine-2,3-dione
—— 5-(4-butoxyphenyl)-1-[3-(diethylamino)propyl]-4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-3-hydroxy-1,5-dihydro-2H-pyrrol-2-one —— C30H38N2O6
5-(4-butoxyphenyl)-1-[3-(diethylamino)propyl]-4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-3-hydroxy-1,5-dihydro-2H-pyrrol-2-one
—— 3-hydroxy-5-(4-methoxyphenyl)-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1-(pyridin-4-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one —— C27H24N2O5
3-hydroxy-5-(4-methoxyphenyl)-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1-(pyridin-4-ylmethyl)-1,5-dihydro-2H-pyrrol-2-one
—— (3R)-2-oxo-1-phenyl-N-(2-pyrrolidin-1-ylethyl)pyrrolidine-3-carboxamide —— C17H23N3O2
(3R)-2-oxo-1-phenyl-N-(2-pyrrolidin-1-ylethyl)pyrrolidine-3-carboxamide
—— (4E)-1-{5-[(4-chlorobenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-5-[3-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione —— C34H32ClN3O5S2
(4E)-1-{5-[(4-chlorobenzyl)sulfanyl]-1,3,4-thiadiazol-2-yl}-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-5-[3-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione
—— ethyl 2-[(3E)-3-{[4-(benzyloxy)-3-methylphenyl](hydroxy)methylidene}-2-(3,4-dimethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C34H32N2O8S
ethyl 2-[(3E)-3-{[4-(benzyloxy)-3-methylphenyl](hydroxy)methylidene}-2-(3,4-dimethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— (3R)-N-[3-(4-methylpiperazin-1-yl)propyl]-2-oxo-1-phenylpyrrolidine-3-carboxamide —— C19H28N4O2
(3R)-N-[3-(4-methylpiperazin-1-yl)propyl]-2-oxo-1-phenylpyrrolidine-3-carboxamide
—— methyl 2-[(3E)-3-{[4-(benzyloxy)-3-methylphenyl](hydroxy)methylidene}-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C31H25N3O8S
methyl 2-[(3E)-3-{[4-(benzyloxy)-3-methylphenyl](hydroxy)methylidene}-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C35H36N2O6S
(4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
—— 4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-1-[3-(dimethylamino)propyl]-3-hydroxy-5-(3-hydroxyphenyl)-1,5-dihydro-2H-pyrrol-2-one —— C24H26N2O6
4-(2,3-dihydro-1,4-benzodioxin-6-ylcarbonyl)-1-[3-(dimethylamino)propyl]-3-hydroxy-5-(3-hydroxyphenyl)-1,5-dihydro-2H-pyrrol-2-one