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    首页 分子通 按分子结构分类 有机化合物 有机杂环化合物 吡咯烷类

    吡咯烷类

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 4-(4-chlorobenzoyl)-5-(4-chlorophenyl)-3-hydroxy-1-(thiazol-2-yl)-1H-pyrrol-2(5H)-one —— C20H12Cl2N2O3S
    4-(4-chlorobenzoyl)-5-(4-chlorophenyl)-3-hydroxy-1-(thiazol-2-yl)-1H-pyrrol-2(5H)-one
    —— (4E)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methylphenyl)methylidene]-5-(4-prop-2-enoxyphenyl)pyrrolidine-2,3-dione —— C28H21FN2O4S
    (4E)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methylphenyl)methylidene]-5-(4-prop-2-enoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-5-(3-methoxyphenyl)pyrrolidine-2,3-dione —— C30H28N2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-5-(3-methoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(3-methoxy-4-pentoxyphenyl)pyrrolidine-2,3-dione —— C30H26F2N2O5S
    (4E)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(3-methoxy-4-pentoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-fluorophenyl)pyrrolidine-2,3-dione —— C26H18ClFN2O4S
    (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-fluorophenyl)pyrrolidine-2,3-dione
    —— (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-5-(4-ethylphenyl)-1-(6-fluoro-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C26H18ClFN2O3S
    (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-5-(4-ethylphenyl)-1-(6-fluoro-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-(3,4-dimethoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C29H26N2O6S
    (4E)-5-(3,4-dimethoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(4-pentoxyphenyl)pyrrolidine-2,3-dione —— C31H29FN2O5S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(4-pentoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-4-[(2,8-dimethylimidazo[1,2-a]pyridin-3-yl)-hydroxymethylidene]-5-(2-methoxyphenyl)-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C27H30N4O5
    (4E)-4-[(2,8-dimethylimidazo[1,2-a]pyridin-3-yl)-hydroxymethylidene]-5-(2-methoxyphenyl)-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C33H34N2O6S
    (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-ethoxy-3-methoxyphenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C31H30N2O7S
    (4E)-5-(4-ethoxy-3-methoxyphenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— 4-[(3E)-3-[(4-chlorophenyl)(hydroxy)methylidene]-2-(4-hydroxy-3-methoxyphenyl)-4,5-dioxopyrrolidin-1-yl]butanoic acid —— C22H20ClNO7
    4-[(3E)-3-[(4-chlorophenyl)(hydroxy)methylidene]-2-(4-hydroxy-3-methoxyphenyl)-4,5-dioxopyrrolidin-1-yl]butanoic acid
    —— (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(1,3-thiazol-2-yl)pyrrolidine-2,3-dione —— C28H30N2O5S
    (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(1,3-thiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C31H40N2O6
    (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— 4-{[2-(4-chlorophenyl)-4-hydroxy-1-(3-methoxypropyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl]carbonyl}-N,N-dimethylbenzenesulfonamide —— C23H25ClN2O6S
    4-{[2-(4-chlorophenyl)-4-hydroxy-1-(3-methoxypropyl)-5-oxo-2,5-dihydro-1H-pyrrol-3-yl]carbonyl}-N,N-dimethylbenzenesulfonamide
    —— (4E)-5-(3-bromo-4-hydroxy-5-methoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-ethoxyphenyl)-hydroxymethylidene]pyrrolidine-2,3-dione —— C29H25BrN2O7S
    (4E)-5-(3-bromo-4-hydroxy-5-methoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-ethoxyphenyl)-hydroxymethylidene]pyrrolidine-2,3-dione
    —— 5-(4-chlorophenyl)-3-hydroxy-1-(3-methoxypropyl)-4-(4-methylbenzoyl)-2,5-dihydro-1H-pyrrol-2-one —— C22H22ClNO4
    5-(4-chlorophenyl)-3-hydroxy-1-(3-methoxypropyl)-4-(4-methylbenzoyl)-2,5-dihydro-1H-pyrrol-2-one
    —— (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione —— C28H31N3O5S
    (4E)-5-[3-ethoxy-4-(3-methylbutoxy)phenyl]-4-[hydroxy-(4-methylphenyl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(3-hydroxyphenyl)pyrrolidine-2,3-dione —— C26H19FN2O5S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]-5-(3-hydroxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-hydroxyphenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]pyrrolidine-2,3-dione —— C29H26N2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-hydroxyphenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-(4,5-dimethyl-1,3-thiazol-2-yl)-4-[(4-fluorophenyl)(hydroxy)methylidene]-5-(3-methoxyphenyl)pyrrolidine-2,3-dione —— C23H19FN2O4S
    (4E)-1-(4,5-dimethyl-1,3-thiazol-2-yl)-4-[(4-fluorophenyl)(hydroxy)methylidene]-5-(3-methoxyphenyl)pyrrolidine-2,3-dione
    —— methyl 4-[(3E)-3-[(4-bromophenyl)-hydroxymethylidene]-1-[2-(2-hydroxyethoxy)ethyl]-4,5-dioxopyrrolidin-2-yl]benzoate —— C23H22BrNO7
    methyl 4-[(3E)-3-[(4-bromophenyl)-hydroxymethylidene]-1-[2-(2-hydroxyethoxy)ethyl]-4,5-dioxopyrrolidin-2-yl]benzoate
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-ethoxyphenyl)-hydroxymethylidene]-5-(4-methoxyphenyl)pyrrolidine-2,3-dione —— C29H26N2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[(4-ethoxyphenyl)-hydroxymethylidene]-5-(4-methoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione —— C34H28N2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-4-{hydroxy[4-(piperidin-1-ylsulfonyl)phenyl]methylidene}-1-(2-methoxyethyl)-5-(4-methoxyphenyl)pyrrolidine-2,3-dione —— C26H30N2O7S
    (4E)-4-{hydroxy[4-(piperidin-1-ylsulfonyl)phenyl]methylidene}-1-(2-methoxyethyl)-5-(4-methoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C31H30N2O5S
    (4E)-5-(4-butoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-hydroxyphenyl)-4-[(4-fluorophenyl)-hydroxymethylidene]pyrrolidine-2,3-dione —— C28H23FN2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-hydroxyphenyl)-4-[(4-fluorophenyl)-hydroxymethylidene]pyrrolidine-2,3-dione
    —— (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-hydroxyphenyl)pyrrolidine-2,3-dione —— C28H23ClN2O6S
    (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-hydroxyphenyl)pyrrolidine-2,3-dione
    —— methyl 4-[(3E)-3-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-4,5-dioxopyrrolidin-2-yl]benzoate —— C30H26N2O7S
    methyl 4-[(3E)-3-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-4,5-dioxopyrrolidin-2-yl]benzoate
    —— 5-[3-ethoxy-4-(pentyloxy)phenyl]-3-hydroxy-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1-[2-(morpholin-4-yl)ethyl]-1,5-dihydro-2H-pyrrol-2-one —— C33H42N2O7
    5-[3-ethoxy-4-(pentyloxy)phenyl]-3-hydroxy-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1-[2-(morpholin-4-yl)ethyl]-1,5-dihydro-2H-pyrrol-2-one
    —— (4E)-5-(3-ethoxy-4-pentoxyphenyl)-1-[5-[(4-fluorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C34H34FN3O5S2
    (4E)-5-(3-ethoxy-4-pentoxyphenyl)-1-[5-[(4-fluorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione —— C36H32N2O7S
    (4E)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-hydroxyphenyl)-4-[hydroxy(phenyl)methylidene]pyrrolidine-2,3-dione —— C26H20N2O5S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(4-hydroxyphenyl)-4-[hydroxy(phenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-(6-chloro-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C32H31ClN2O5S
    (4E)-1-(6-chloro-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione —— C30H32N2O5
    (4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione
    —— (4E)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-5-(3-ethoxy-4-phenylmethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C36H29Cl2N3O5S2
    (4E)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-5-(3-ethoxy-4-phenylmethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-hydroxy-3-methoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C27H22N2O7S
    (4E)-5-(4-hydroxy-3-methoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-ethoxyphenyl)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C33H31Cl2N3O5S2
    (4E)-5-(4-butoxy-3-ethoxyphenyl)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-(5-benzylsulfanyl-1,3,4-thiadiazol-2-yl)-5-(3-ethoxy-4-propoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C32H31N3O5S2
    (4E)-1-(5-benzylsulfanyl-1,3,4-thiadiazol-2-yl)-5-(3-ethoxy-4-propoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-fluorophenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C28H23FN2O5S
    (4E)-5-(4-fluorophenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-4-[(4-ethoxyphenyl)-hydroxymethylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-(4-propoxyphenyl)pyrrolidine-2,3-dione —— C30H28N2O6S
    (4E)-4-[(4-ethoxyphenyl)-hydroxymethylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-(4-propoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-[3-(diethylamino)propyl]-5-(3-ethoxy-4-prop-2-enoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C30H38N2O5
    (4E)-1-[3-(diethylamino)propyl]-5-(3-ethoxy-4-prop-2-enoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-[3-methoxy-4-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione —— C32H32N2O7S
    (4E)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)-5-[3-methoxy-4-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione
    —— (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-phenylmethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C36H32N2O6S
    (4E)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-5-(3-ethoxy-4-phenylmethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (E)-{2-(2,4-dichlorophenyl)-1-[3-(morpholin-4-ium-4-yl)propyl]-4,5-dioxopyrrolidin-3-ylidene}(4-fluorophenyl)methanolate —— C24H23Cl2FN2O4
    (E)-{2-(2,4-dichlorophenyl)-1-[3-(morpholin-4-ium-4-yl)propyl]-4,5-dioxopyrrolidin-3-ylidene}(4-fluorophenyl)methanolate
    —— (4E)-5-(4-chlorophenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C28H23ClN2O5S
    (4E)-5-(4-chlorophenyl)-4-[hydroxy-(4-propoxyphenyl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— methyl 2-[(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy-(4-methylphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H32N2O7S
    methyl 2-[(3E)-2-(4-butoxy-3-ethoxyphenyl)-3-[hydroxy-(4-methylphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-1-[2-(diethylamino)ethyl]-5-(3-ethoxy-4-prop-2-enoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C29H36N2O5
    (4E)-1-[2-(diethylamino)ethyl]-5-(3-ethoxy-4-prop-2-enoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(3-ethoxy-4-phenylmethoxyphenyl)-1-[5-[(4-fluorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione —— C36H30FN3O5S2
    (4E)-5-(3-ethoxy-4-phenylmethoxyphenyl)-1-[5-[(4-fluorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy-(4-methylphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione —— C27H29N3O5S
    (4E)-5-(4-butoxy-3-ethoxyphenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione