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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,5R)-1-benzyl-5-(3-bromophenyl)-4-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]pyrrolidine-2,3-dione —— C27H22BrNO4
    (4E,5R)-1-benzyl-5-(3-bromophenyl)-4-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]pyrrolidine-2,3-dione
    —— (4E,5R)-1-benzyl-5-(3-bromophenyl)-4-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]pyrrolidine-2,3-dione —— C27H22BrNO4
    (4E,5R)-1-benzyl-5-(3-bromophenyl)-4-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]pyrrolidine-2,3-dione
    —— (3R)-3-(2-methylphenyl)-3-[2-oxo-2-[(1S,5S)-1,3,3-trimethyl-6-azabicyclo[3.2.1]octan-6-yl]ethyl]-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C29H35N3O3
    (3R)-3-(2-methylphenyl)-3-[2-oxo-2-[(1S,5S)-1,3,3-trimethyl-6-azabicyclo[3.2.1]octan-6-yl]ethyl]-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (3R)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C29H33N3O3
    (3R)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C25H19BrClN3O3
    (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3R,3aR,6aS)-5-(2-bromophenyl)-3-(4-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C24H19BrN2O3
    (3R,3aR,6aS)-5-(2-bromophenyl)-3-(4-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-fluorophenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C24H16BrClFN3O3
    (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-fluorophenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C26H21BrCl2N4O3
    (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3S)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C29H33N3O3
    (3S)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (1S,2S,6S,7S)-4-[3-[3-(3,4-dimethoxyphenyl)-1,2,4-oxadiazol-5-yl]phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione —— C25H23N3O5
    (1S,2S,6S,7S)-4-[3-[3-(3,4-dimethoxyphenyl)-1,2,4-oxadiazol-5-yl]phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
    —— [4-[(3R,3aR,6aS)-5-(3-methylphenyl)-4,6-dioxo-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-3-yl]phenyl] benzenesulfonate —— C30H24N2O6S
    [4-[(3R,3aR,6aS)-5-(3-methylphenyl)-4,6-dioxo-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-3-yl]phenyl] benzenesulfonate
    —— (3S,3aR,6aS)-2,3-diphenyl-5-(4-propoxyphenyl)-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C26H24N2O4
    (3S,3aR,6aS)-2,3-diphenyl-5-(4-propoxyphenyl)-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (4E,5S)-5-(3-bromophenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione —— C26H19BrN2O3S
    (4E,5S)-5-(3-bromophenyl)-4-[hydroxy-(4-methylphenyl)methylidene]-1-(6-methyl-1,3-benzothiazol-2-yl)pyrrolidine-2,3-dione
    —— [4-[(3S,3aR,6aS)-5-(3-methylphenyl)-4,6-dioxo-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-3-yl]phenyl] benzenesulfonate —— C30H24N2O6S
    [4-[(3S,3aR,6aS)-5-(3-methylphenyl)-4,6-dioxo-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-3-yl]phenyl] benzenesulfonate
    —— (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C25H19BrClN3O3
    (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (4E,5R)-5-(3-bromophenyl)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]pyrrolidine-2,3-dione —— C24H13BrF2N2O3S
    (4E,5R)-5-(3-bromophenyl)-1-(6-fluoro-1,3-benzothiazol-2-yl)-4-[(4-fluorophenyl)-hydroxymethylidene]pyrrolidine-2,3-dione
    —— (4E,5S)-1-benzyl-5-(3-bromophenyl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]pyrrolidine-2,3-dione —— C26H20BrNO5
    (4E,5S)-1-benzyl-5-(3-bromophenyl)-4-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]pyrrolidine-2,3-dione
    —— phenyl (2S,6R,8R,12S)-1,14-dimethyl-4,10-bis(2-methylphenyl)-3,5,9,11-tetraoxo-4,10-diazatetracyclo[5.5.2.02,6.08,12]tetradec-13-ene-13-carboxylate —— C35H30N2O6
    phenyl (2S,6R,8R,12S)-1,14-dimethyl-4,10-bis(2-methylphenyl)-3,5,9,11-tetraoxo-4,10-diazatetracyclo[5.5.2.02,6.08,12]tetradec-13-ene-13-carboxylate
    —— (2R,6R,7S,9R,13R,14R)-4,11-bis(4-methoxyphenyl)-7,14-diphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone —— C36H30N4O6
    (2R,6R,7S,9R,13R,14R)-4,11-bis(4-methoxyphenyl)-7,14-diphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone
    —— (3aS,4R,7R,7aR)-2-(4-chlorophenyl)-7-methyl-4,7a-dihydro-3aH-4,7-epoxyisoindole-1,3-dione —— C15H12ClNO3
    (3aS,4R,7R,7aR)-2-(4-chlorophenyl)-7-methyl-4,7a-dihydro-3aH-4,7-epoxyisoindole-1,3-dione
    —— (3S,3aS,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C26H21BrCl2N4O3
    (3S,3aS,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (4E,5S)-1-(6-bromo-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-phenylpyrrolidine-2,3-dione —— C24H15BrN2O3S
    (4E,5S)-1-(6-bromo-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-phenylpyrrolidine-2,3-dione
    —— (3S)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C25H27N3O3
    (3S)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (2R,6R,7R,9R,13R,14S)-4,7,11,14-tetraphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone —— C34H26N4O4
    (2R,6R,7R,9R,13R,14S)-4,7,11,14-tetraphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone
    —— (3S)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-phenyl-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C28H31N3O3
    (3S)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-phenyl-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (1S,2R,6S,7S)-4-[4-(5-nitro-1,3-dioxoisoindol-2-yl)phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione —— C23H17N3O6
    (1S,2R,6S,7S)-4-[4-(5-nitro-1,3-dioxoisoindol-2-yl)phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
    —— (3R,3aS,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C25H19BrClN3O3
    (3R,3aS,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3R,3aS,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C26H21BrCl2N4O3
    (3R,3aS,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (1S,2R,6S,7S)-4-[3-[3-(3,4-dimethoxyphenyl)-1,2,4-oxadiazol-5-yl]phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione —— C25H23N3O5
    (1S,2R,6S,7S)-4-[3-[3-(3,4-dimethoxyphenyl)-1,2,4-oxadiazol-5-yl]phenyl]-4-azatricyclo[5.2.1.02,6]decane-3,5-dione
    —— (2R,6S,7S,9R,13R,14R)-4,7,11,14-tetraphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone —— C34H26N4O4
    (2R,6S,7S,9R,13R,14R)-4,7,11,14-tetraphenyl-1,4,8,11-tetrazatetracyclo[6.6.0.02,6.09,13]tetradecane-3,5,10,12-tetrone
    —— (3R)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C25H27N3O3
    (3R)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(2-methylphenyl)-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (3R,3aR,6aS)-1-(3-bromobenzoyl)-3-[4-(dimethylamino)phenyl]-5-(4-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C27H25BrN4O3
    (3R,3aR,6aS)-1-(3-bromobenzoyl)-3-[4-(dimethylamino)phenyl]-5-(4-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— 5-(4-ethylphenyl)-3-hydroxy-1-(2-methoxyethyl)-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1,5-dihydro-2H-pyrrol-2-one —— C25H27NO5
    5-(4-ethylphenyl)-3-hydroxy-1-(2-methoxyethyl)-4-[(2-methyl-2,3-dihydro-1-benzofuran-5-yl)carbonyl]-1,5-dihydro-2H-pyrrol-2-one
    —— (3R,3aS,6aS)-5-(3-chloro-2-methylphenyl)-3-(3-methoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C25H21ClN2O4
    (3R,3aS,6aS)-5-(3-chloro-2-methylphenyl)-3-(3-methoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C26H21BrCl2N4O3
    (3S,3aR,6aS)-1-(3-bromobenzoyl)-5-(2,4-dichlorophenyl)-3-[4-(dimethylamino)phenyl]-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3aR,4R,7R,7aS)-2-(4-chlorophenyl)-7-methyl-4,7a-dihydro-3aH-4,7-epoxyisoindole-1,3-dione —— C15H12ClNO3
    (3aR,4R,7R,7aS)-2-(4-chlorophenyl)-7-methyl-4,7a-dihydro-3aH-4,7-epoxyisoindole-1,3-dione
    —— (3S,3aS,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C25H19BrClN3O3
    (3S,3aS,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-methylphenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— phenyl (2S,6S,8R,12S)-1,14-dimethyl-4,10-bis(2-methylphenyl)-3,5,9,11-tetraoxo-4,10-diazatetracyclo[5.5.2.02,6.08,12]tetradec-13-ene-13-carboxylate —— C35H30N2O6
    phenyl (2S,6S,8R,12S)-1,14-dimethyl-4,10-bis(2-methylphenyl)-3,5,9,11-tetraoxo-4,10-diazatetracyclo[5.5.2.02,6.08,12]tetradec-13-ene-13-carboxylate
    —— (3S,3aR,6aS)-5-(3-chloro-2-methylphenyl)-3-(3-methoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C25H21ClN2O4
    (3S,3aR,6aS)-5-(3-chloro-2-methylphenyl)-3-(3-methoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-fluorophenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione —— C24H16BrClFN3O3
    (3R,3aR,6aS)-1-(3-bromobenzoyl)-5-(2-chlorophenyl)-3-(2-fluorophenyl)-2,3,3a,6a-tetrahydropyrrolo[3,4-c]pyrazole-4,6-dione
    —— (3R)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-phenyl-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione —— C28H31N3O3
    (3R)-3-[2-[(1S,8S)-4-azatricyclo[4.3.1.13,8]undecan-4-yl]-2-oxoethyl]-3-phenyl-1-(pyridin-4-ylmethyl)pyrrolidine-2,5-dione
    —— (3S,3aS,6aS)-3-(4-butoxy-3-ethoxyphenyl)-5-(2-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C30H32N2O5
    (3S,3aS,6aS)-3-(4-butoxy-3-ethoxyphenyl)-5-(2-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3R,3aS,6aS)-3-(4,5-dimethoxy-2-nitrophenyl)-5-(4-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C26H23N3O7
    (3R,3aS,6aS)-3-(4,5-dimethoxy-2-nitrophenyl)-5-(4-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3S)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(3-fluorophenyl)-1-(pyridin-3-ylmethyl)pyrrolidine-2,5-dione —— C24H24FN3O3
    (3S)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-(3-fluorophenyl)-1-(pyridin-3-ylmethyl)pyrrolidine-2,5-dione
    —— (3R)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-phenyl-1-(2-pyridin-2-ylethyl)pyrrolidine-2,5-dione —— C25H27N3O3
    (3R)-3-[2-[(1R,4R)-2-azabicyclo[2.2.1]heptan-2-yl]-2-oxoethyl]-3-phenyl-1-(2-pyridin-2-ylethyl)pyrrolidine-2,5-dione
    —— (3S,3aS,6aS)-3-(2,4-dichlorophenyl)-5-(4-ethylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C25H20Cl2N2O3
    (3S,3aS,6aS)-3-(2,4-dichlorophenyl)-5-(4-ethylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (4E,5R)-1-(6-bromo-1,3-benzothiazol-2-yl)-5-(2-fluorophenyl)-4-[hydroxy(phenyl)methylidene]pyrrolidine-2,3-dione —— C24H14BrFN2O3S
    (4E,5R)-1-(6-bromo-1,3-benzothiazol-2-yl)-5-(2-fluorophenyl)-4-[hydroxy(phenyl)methylidene]pyrrolidine-2,3-dione
    —— (4E,5R)-1-(6-bromo-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-phenylpyrrolidine-2,3-dione —— C24H15BrN2O3S
    (4E,5R)-1-(6-bromo-1,3-benzothiazol-2-yl)-4-[hydroxy(phenyl)methylidene]-5-phenylpyrrolidine-2,3-dione
    —— (3R,3aS,6aS)-3-(4-butoxy-3-ethoxyphenyl)-5-(2-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C30H32N2O5
    (3R,3aS,6aS)-3-(4-butoxy-3-ethoxyphenyl)-5-(2-methylphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione
    —— (3S,3aS,6aS)-3-(4-chlorophenyl)-5-(4-ethoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione —— C25H21ClN2O4
    (3S,3aS,6aS)-3-(4-chlorophenyl)-5-(4-ethoxyphenyl)-2-phenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione