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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
    —— (4E)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)-1-[5-[(4-methylphenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]pyrrolidine-2,3-dione —— C34H28N4O5S2
    (4E)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)-1-[5-[(4-methylphenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]pyrrolidine-2,3-dione
    —— (4E)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-5-(3-propoxyphenyl)pyrrolidine-2,3-dione —— C28H26N2O7S
    (4E)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-5-(3-propoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione —— C31H34N2O6
    (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(pyridin-4-ylmethyl)pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-2-(4-ethoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H26N2O7S
    ethyl 2-[(3E)-2-(4-ethoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[3-(dimethylamino)propyl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C26H33N3O5
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[3-(dimethylamino)propyl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-1-[5-[(4-chlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione —— C33H25ClN4O5S2
    (4E)-1-[5-[(4-chlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-2-(3-ethoxy-4-pentoxyphenyl)-3-[hydroxy-(4-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C32H36N2O8S
    ethyl 2-[(3E)-2-(3-ethoxy-4-pentoxyphenyl)-3-[hydroxy-(4-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione —— C30H25N3O6S
    (4E)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)pyrrolidine-2,3-dione
    —— (4E)-1-benzyl-4-[hydroxy(pyridin-4-yl)methylidene]-5-[3-methoxy-4-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione —— C29H30N2O5
    (4E)-1-benzyl-4-[hydroxy(pyridin-4-yl)methylidene]-5-[3-methoxy-4-(3-methylbutoxy)phenyl]pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-2-(4-ethoxy-3-methoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C28H28N2O8S
    ethyl 2-[(3E)-2-(4-ethoxy-3-methoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— ethyl 2-[(3E)-2-(4-hydroxy-3-methoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C26H24N2O8S
    ethyl 2-[(3E)-2-(4-hydroxy-3-methoxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— ethyl 2-[(3E)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C29H30N2O6S
    ethyl 2-[(3E)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(furan-2-ylmethyl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C26H26N2O6
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(furan-2-ylmethyl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(pyridin-3-ylmethyl)pyrrolidine-2,3-dione —— C31H34N2O6
    (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(pyridin-3-ylmethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C27H33N3O6
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxyphenyl)-4-[hydroxy-(3-methyl-4-propoxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C31H40N2O6
    (4E)-5-(4-butoxyphenyl)-4-[hydroxy-(3-methyl-4-propoxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-1-[2-(dimethylamino)ethyl]-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione —— C29H38N2O6
    (4E)-1-[2-(dimethylamino)ethyl]-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-4-[(4-butoxy-2-methylphenyl)-hydroxymethylidene]-5-(4-butoxyphenyl)-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C32H42N2O6
    (4E)-4-[(4-butoxy-2-methylphenyl)-hydroxymethylidene]-5-(4-butoxyphenyl)-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-1-[3-(dimethylamino)propyl]-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione —— C30H40N2O6
    (4E)-1-[3-(dimethylamino)propyl]-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxyphenyl)-4-[hydroxy-[2-methyl-4-(2-methylpropoxy)phenyl]methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C32H42N2O6
    (4E)-5-(4-butoxyphenyl)-4-[hydroxy-[2-methyl-4-(2-methylpropoxy)phenyl]methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-ethoxyphenyl)-1-(4,6-dimethyl-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione —— C33H34N2O6S
    (4E)-5-(4-butoxy-3-ethoxyphenyl)-1-(4,6-dimethyl-1,3-benzothiazol-2-yl)-4-[hydroxy-(4-methoxyphenyl)methylidene]pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-2-(3-ethoxy-4-hydroxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H26N2O8S
    ethyl 2-[(3E)-2-(3-ethoxy-4-hydroxyphenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxyphenyl)-4-[hydroxy-[4-(2-methylpropoxy)phenyl]methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C31H40N2O6
    (4E)-5-(4-butoxyphenyl)-4-[hydroxy-[4-(2-methylpropoxy)phenyl]methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-methoxypropyl)pyrrolidine-2,3-dione —— C25H30N2O6
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-methoxypropyl)pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C31H27N3O7S
    ethyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C31H40N2O7
    (4E)-5-(3-ethoxy-4-pentoxyphenyl)-4-[hydroxy-(4-methoxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-imidazol-1-ylpropyl)pyrrolidine-2,3-dione —— C27H30N4O5
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-imidazol-1-ylpropyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C30H29N3O6S
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(6-ethoxy-1,3-benzothiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— 5-(4-tert-butylphenyl)-1-[3-(dimethylamino)propyl]-4-[(3-fluoro-4-methoxyphenyl)carbonyl]-3-hydroxy-1,5-dihydro-2H-pyrrol-2-one —— C27H33FN2O4
    5-(4-tert-butylphenyl)-1-[3-(dimethylamino)propyl]-4-[(3-fluoro-4-methoxyphenyl)carbonyl]-3-hydroxy-1,5-dihydro-2H-pyrrol-2-one
    —— (4E)-5-(4-butoxyphenyl)-4-[hydroxy-(2-methyl-4-propan-2-yloxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C31H40N2O6
    (4E)-5-(4-butoxyphenyl)-4-[hydroxy-(2-methyl-4-propan-2-yloxyphenyl)methylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)-1-(1,3-thiazol-2-yl)pyrrolidine-2,3-dione —— C27H21N3O5S
    (4E)-4-[hydroxy(pyridin-4-yl)methylidene]-5-(3-methoxy-4-phenylmethoxyphenyl)-1-(1,3-thiazol-2-yl)pyrrolidine-2,3-dione
    —— methyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H25N3O7S
    methyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(6-chloro-1,3-benzothiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C28H24ClN3O5S
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-(6-chloro-1,3-benzothiazol-2-yl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— methyl 2-[(3E)-2-(3-ethoxy-4-pentoxyphenyl)-3-[hydroxy-(4-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C31H34N2O8S
    methyl 2-[(3E)-2-(3-ethoxy-4-pentoxyphenyl)-3-[hydroxy-(4-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— ethyl 2-[(3E)-2-(3-bromophenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C25H21BrN2O6S
    ethyl 2-[(3E)-2-(3-bromophenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione —— C24H24N4O5S
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(5-methyl-1,3,4-thiadiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C29H27N3O6S
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(6-methoxy-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-2-(3,4-dichlorophenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C25H20Cl2N2O6S
    ethyl 2-[(3E)-2-(3,4-dichlorophenyl)-3-[hydroxy-(3-methoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-4-[hydroxy-(4-phenylmethoxyphenyl)methylidene]-5-[3-methoxy-4-(3-methylbutoxy)phenyl]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C36H42N2O7
    (4E)-4-[hydroxy-(4-phenylmethoxyphenyl)methylidene]-5-[3-methoxy-4-(3-methylbutoxy)phenyl]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(pyridin-3-ylmethyl)pyrrolidine-2,3-dione —— C27H27N3O5
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(pyridin-3-ylmethyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[2-(diethylamino)ethyl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C27H35N3O5
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[2-(diethylamino)ethyl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— prop-2-enyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C32H27N3O7S
    prop-2-enyl 2-[(3E)-3-[hydroxy(pyridin-4-yl)methylidene]-2-(3-methoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-1-benzyl-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C28H28N2O5
    (4E)-1-benzyl-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-morpholin-4-ylpropyl)pyrrolidine-2,3-dione —— C28H35N3O6
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(3-morpholin-4-ylpropyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C29H27N3O5S
    (4E)-5-(4-butoxy-3-methoxyphenyl)-4-[hydroxy(pyridin-4-yl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-tert-butylphenyl)-4-[hydroxy-(3-methyl-4-prop-2-enoxyphenyl)methylidene]-1-(3-morpholin-4-ylpropyl)pyrrolidine-2,3-dione —— C32H40N2O5
    (4E)-5-(4-tert-butylphenyl)-4-[hydroxy-(3-methyl-4-prop-2-enoxyphenyl)methylidene]-1-(3-morpholin-4-ylpropyl)pyrrolidine-2,3-dione
    —— (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione —— C30H26Cl2N4O5S2
    (4E)-5-(4-butoxy-3-methoxyphenyl)-1-[5-[(2,4-dichlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-4-[hydroxy(pyridin-4-yl)methylidene]pyrrolidine-2,3-dione
    —— ethyl 2-[(3E)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C25H21N3O8S
    ethyl 2-[(3E)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— (4E)-5-(4-butoxyphenyl)-4-[(4-ethoxy-2-methylphenyl)-hydroxymethylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione —— C30H38N2O6
    (4E)-5-(4-butoxyphenyl)-4-[(4-ethoxy-2-methylphenyl)-hydroxymethylidene]-1-(2-morpholin-4-ylethyl)pyrrolidine-2,3-dione
    —— methyl 2-[(3E)-2-(4-butoxy-3-methoxyphenyl)-3-[hydroxy(pyridin-4-yl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H27N3O7S
    methyl 2-[(3E)-2-(4-butoxy-3-methoxyphenyl)-3-[hydroxy(pyridin-4-yl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate