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    —— methyl 2-[(2S)-3-[(4-butoxy-3-methylphenyl)-hydroxymethylidene]-2-(4-methylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C29H30N2O6S
    methyl 2-[(2S)-3-[(4-butoxy-3-methylphenyl)-hydroxymethylidene]-2-(4-methylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— methyl 2-[(2S)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C28H24N2O8S
    methyl 2-[(2S)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— methyl 2-[(2R)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-(3-ethoxy-4-prop-2-enoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H28N2O9S
    methyl 2-[(2R)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-(3-ethoxy-4-prop-2-enoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— methyl (6R)-2-[(3R,3aS,6aS)-4,6-dioxo-2,3-diphenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-5-yl]-6-tert-butyl-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate —— C31H32N2O5S
    methyl (6R)-2-[(3R,3aS,6aS)-4,6-dioxo-2,3-diphenyl-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazol-5-yl]-6-tert-butyl-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate
    —— methyl 2-[(2R)-3-[(4-butoxy-3-methylphenyl)-hydroxymethylidene]-2-(4-methylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C29H30N2O6S
    methyl 2-[(2R)-3-[(4-butoxy-3-methylphenyl)-hydroxymethylidene]-2-(4-methylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— methyl N-[6-[cyclopentyloxy-[(2R,3S)-3-(1,3-dioxan-5-yloxycarbonylamino)-2-hydroxy-4-phenylbutyl]sulfamoyl]-1H-benzimidazol-2-yl]carbamate —— C29H37N5O10S
    methyl N-[6-[cyclopentyloxy-[(2R,3S)-3-(1,3-dioxan-5-yloxycarbonylamino)-2-hydroxy-4-phenylbutyl]sulfamoyl]-1H-benzimidazol-2-yl]carbamate
    —— methyl (2R)-1-[2-[4-[[(2R)-2-[(2-amino-2-methylpropanoyl)amino]-4-phenylbutanoyl]amino]imidazol-1-yl]-2-phenylacetyl]pyrrolidine-2-carboxylate —— C31H38N6O5
    methyl (2R)-1-[2-[4-[[(2R)-2-[(2-amino-2-methylpropanoyl)amino]-4-phenylbutanoyl]amino]imidazol-1-yl]-2-phenylacetyl]pyrrolidine-2-carboxylate
    —— methyl 3-[[2-[4-[(R)-(4-chlorophenyl)-phenylmethyl]piperazin-1-yl]acetyl]amino]-4-methoxy-1H-indole-2-carboxylate —— C30H31ClN4O4
    methyl 3-[[2-[4-[(R)-(4-chlorophenyl)-phenylmethyl]piperazin-1-yl]acetyl]amino]-4-methoxy-1H-indole-2-carboxylate
    —— Methyl 1-[1-[(2-methylpropan-2-yl)oxycarbonyl]piperidin-4-yl]oxy-7-phenylmethoxy-4-(3,4,5-trimethoxyphenyl)isoquinoline-3-carboxylate —— C37H42N2O9
    Methyl 1-[1-[(2-methylpropan-2-yl)oxycarbonyl]piperidin-4-yl]oxy-7-phenylmethoxy-4-(3,4,5-trimethoxyphenyl)isoquinoline-3-carboxylate
    —— methyl 5-[2-[(2S)-2,6-diaminohexanoyl]oxy-3-(3-ethoxycarbonyl-4-oxochromen-5-yl)oxypropoxy]-4-oxochromene-3-carboxylate —— C32H34N2O12
    methyl 5-[2-[(2S)-2,6-diaminohexanoyl]oxy-3-(3-ethoxycarbonyl-4-oxochromen-5-yl)oxypropoxy]-4-oxochromene-3-carboxylate
    —— methyl 2-[(2S,3R,4R,6R)-3-methoxy-2-methyl-4-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]-16-oxo-29-oxa-1,7,17-triazaoctacyclo[12.12.2.12,6.07,28.08,13.015,19.020,27.021,26]nonacosa-8,10,12,14,19,21,23,25,27-nonaen-17-yl]acetate —— C36H38N4O7
    methyl 2-[(2S,3R,4R,6R)-3-methoxy-2-methyl-4-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]-16-oxo-29-oxa-1,7,17-triazaoctacyclo[12.12.2.12,6.07,28.08,13.015,19.020,27.021,26]nonacosa-8,10,12,14,19,21,23,25,27-nonaen-17-yl]acetate
    —— methyl 4-[(E)-2-cyano-3-[(2-methyl-1-benzofuran-5-yl)amino]-3-[[(3S)-2-oxo-1-(2-oxo-2-pyrrolidin-1-ylethyl)azepan-3-yl]amino]prop-2-enoyl]benzoate —— C33H35N5O6
    methyl 4-[(E)-2-cyano-3-[(2-methyl-1-benzofuran-5-yl)amino]-3-[[(3S)-2-oxo-1-(2-oxo-2-pyrrolidin-1-ylethyl)azepan-3-yl]amino]prop-2-enoyl]benzoate
    —— Methyl 2-chloro-7-[4-[[(2-methylpropan-2-yl)oxycarbonylamino]methyl]phenyl]-8-oxo-5-(3,4,5-trimethoxyphenyl)-1,7-naphthyridine-6-carboxylate —— C31H32ClN3O8
    Methyl 2-chloro-7-[4-[[(2-methylpropan-2-yl)oxycarbonylamino]methyl]phenyl]-8-oxo-5-(3,4,5-trimethoxyphenyl)-1,7-naphthyridine-6-carboxylate
    —— methyl (2R)-2-[1-[2-[[(2R,3R,4R,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]methyl]prop-2-enyl]piperidin-4-yl]octadecanoate —— C34H63NO7
    methyl (2R)-2-[1-[2-[[(2R,3R,4R,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]methyl]prop-2-enyl]piperidin-4-yl]octadecanoate
    —— methyl 3-[[2-[4-[(S)-(4-chlorophenyl)-phenylmethyl]piperazin-1-yl]acetyl]amino]-4-methoxy-1H-indole-2-carboxylate —— C30H31ClN4O4
    methyl 3-[[2-[4-[(S)-(4-chlorophenyl)-phenylmethyl]piperazin-1-yl]acetyl]amino]-4-methoxy-1H-indole-2-carboxylate
    —— methyl 4-[(2R)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate —— C28H24N2O7S
    methyl 4-[(2R)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate
    —— methyl 4-[(2S)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate —— C28H24N2O7S
    methyl 4-[(2S)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate
    —— Methyl 4-[2-[2-[bis(methylsulfonyl)amino]-4-(trifluoromethyl)phenyl]acetyl]-3-(pyrrolidin-1-ylmethyl)piperazine-1-carboxylate —— C22H31F3N4O7S2
    Methyl 4-[2-[2-[bis(methylsulfonyl)amino]-4-(trifluoromethyl)phenyl]acetyl]-3-(pyrrolidin-1-ylmethyl)piperazine-1-carboxylate
    —— Morpholin-4-yl-[8-(pyridin-2-ylmethyl)-2,8-diazaspiro[4.5]decan-2-yl]methanone —— C19H28N4O2
    Morpholin-4-yl-[8-(pyridin-2-ylmethyl)-2,8-diazaspiro[4.5]decan-2-yl]methanone
    —— methyl (2S)-2-{2-(4-fluorophenyl)-4-[1-(4-fluorophenyl)-2-(imidazol-1-yl)ethylamino]benzoylamino}-4-methylsulfanylbutyrate 223766-75-4 C30H30F2N4O3S
    methyl (2S)-2-{2-(4-fluorophenyl)-4-[1-(4-fluorophenyl)-2-(imidazol-1-yl)ethylamino]benzoylamino}-4-methylsulfanylbutyrate
    —— methyl 4-[(2S)-3-[hydroxy-[4-[(2-methylphenyl)methoxy]phenyl]methylidene]-4,5-dioxo-1-(pyridin-3-ylmethyl)pyrrolidin-2-yl]benzoate —— C33H28N2O6
    methyl 4-[(2S)-3-[hydroxy-[4-[(2-methylphenyl)methoxy]phenyl]methylidene]-4,5-dioxo-1-(pyridin-3-ylmethyl)pyrrolidin-2-yl]benzoate
    —— methyl 4-[(2R)-3-[hydroxy-[4-[(2-methylphenyl)methoxy]phenyl]methylidene]-4,5-dioxo-1-(pyridin-3-ylmethyl)pyrrolidin-2-yl]benzoate —— C33H28N2O6
    methyl 4-[(2R)-3-[hydroxy-[4-[(2-methylphenyl)methoxy]phenyl]methylidene]-4,5-dioxo-1-(pyridin-3-ylmethyl)pyrrolidin-2-yl]benzoate
    —— methyl (1S,8S,9S,13S)-1-(4-bromophenyl)-11-[(E)-3-(2-methoxyphenyl)prop-2-enoyl]-11-azatetracyclo[6.5.2.02,7.09,13]pentadeca-2,4,6-triene-9-carboxylate —— C32H30BrNO4
    methyl (1S,8S,9S,13S)-1-(4-bromophenyl)-11-[(E)-3-(2-methoxyphenyl)prop-2-enoyl]-11-azatetracyclo[6.5.2.02,7.09,13]pentadeca-2,4,6-triene-9-carboxylate
    —— methyl 4-[[(2S)-2-(2,3-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O8
    methyl 4-[[(2S)-2-(2,3-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— Metvan —— C28H24N4O5SV
    Metvan
    —— Methyl 1-(2-pyridin-2-ylethoxy)-7-(pyridin-2-ylmethoxy)-4-(3,4,5-trimethoxyphenyl)isoquinoline-3-carboxylate —— C33H31N3O7
    Methyl 1-(2-pyridin-2-ylethoxy)-7-(pyridin-2-ylmethoxy)-4-(3,4,5-trimethoxyphenyl)isoquinoline-3-carboxylate
    —— Morpholin-4-yl-[2-(1,3-thiazol-2-ylmethyl)-2,8-diazaspiro[4.5]decan-8-yl]methanone —— C17H26N4O2S
    Morpholin-4-yl-[2-(1,3-thiazol-2-ylmethyl)-2,8-diazaspiro[4.5]decan-8-yl]methanone
    —— methyl 4-[[(2S)-2-(3,4-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O8
    methyl 4-[[(2S)-2-(3,4-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl 4-[[(2R)-2-(3,4-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O8
    methyl 4-[[(2R)-2-(3,4-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl 4-[[(2R)-2-(2,3-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O8
    methyl 4-[[(2R)-2-(2,3-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl N-[[4-bromo-7,7,8,8-tetrafluoro-2-(trifluoromethyl)-[1,4]dioxino[2,3-g]benzimidazol-1-yl]methyl]-N-butylcarbamate —— C17H15BrF7N3O4
    methyl N-[[4-bromo-7,7,8,8-tetrafluoro-2-(trifluoromethyl)-[1,4]dioxino[2,3-g]benzimidazol-1-yl]methyl]-N-butylcarbamate
    —— methyl N-[1-[4-(4-fluorophenoxy)butyl]piperidin-4-yl]-N-methyl-N'-phenylcarbamimidothioate —— C24H32FN3OS
    methyl N-[1-[4-(4-fluorophenoxy)butyl]piperidin-4-yl]-N-methyl-N'-phenylcarbamimidothioate
    —— methyl (2'S,6S,9aR)-2'-[[tert-butyl(diphenyl)silyl]oxymethyl]-4-oxospiro[7,8,9,9a-tetrahydro-1H-quinolizine-6,1'-cyclopentane]-3-carboxylate —— C32H41NO4Si
    methyl (2'S,6S,9aR)-2'-[[tert-butyl(diphenyl)silyl]oxymethyl]-4-oxospiro[7,8,9,9a-tetrahydro-1H-quinolizine-6,1'-cyclopentane]-3-carboxylate
    —— methyl 2-[[(2R)-4-[(4-aminoquinazolin-7-yl)methyl]-1-[2-(5-chlorothiophen-2-yl)oxyacetyl]-3-oxopiperazin-2-yl]methoxy]acetate —— C23H24ClN5O6S
    methyl 2-[[(2R)-4-[(4-aminoquinazolin-7-yl)methyl]-1-[2-(5-chlorothiophen-2-yl)oxyacetyl]-3-oxopiperazin-2-yl]methoxy]acetate
    —— methyl (2S)-2-(2-methoxyanilino)-2-methylbutanoate —— C13H19NO3
    methyl (2S)-2-(2-methoxyanilino)-2-methylbutanoate
    —— methyl 4-[hydroxy-[(2R)-2-(4-methoxycarbonylphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H33N3O8
    methyl 4-[hydroxy-[(2R)-2-(4-methoxycarbonylphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— Methyl 2-[2-benzyl-4-[2-hydroxy-3-[[1-(4-methoxyphenyl)-2-methylpropan-2-yl]amino]propoxy]phenyl]acetate —— C30H37NO5
    Methyl 2-[2-benzyl-4-[2-hydroxy-3-[[1-(4-methoxyphenyl)-2-methylpropan-2-yl]amino]propoxy]phenyl]acetate
    —— methyl N-[4-[3-[[(2S)-2-hydroxy-3-(4-hydroxyphenoxy)propyl]amino]-1-[4-(methoxycarbonylamino)phenyl]propyl]phenyl]carbamate —— C28H33N3O7
    methyl N-[4-[3-[[(2S)-2-hydroxy-3-(4-hydroxyphenoxy)propyl]amino]-1-[4-(methoxycarbonylamino)phenyl]propyl]phenyl]carbamate
    —— Methyl 4-[[1-[4-methyl-2-(quinoline-2-carbonylamino)pentanoyl]-4-oxopyrrolidin-3-yl]oxymethyl]benzoate —— C29H31N3O6
    Methyl 4-[[1-[4-methyl-2-(quinoline-2-carbonylamino)pentanoyl]-4-oxopyrrolidin-3-yl]oxymethyl]benzoate
    —— methyl (1S,8S,9S,13S)-1-(3-cyanophenyl)-11-[(E)-3-(2-methoxyphenyl)prop-2-enoyl]-11-azatetracyclo[6.5.2.02,7.09,13]pentadeca-2,4,6-triene-9-carboxylate —— C33H30N2O4
    methyl (1S,8S,9S,13S)-1-(3-cyanophenyl)-11-[(E)-3-(2-methoxyphenyl)prop-2-enoyl]-11-azatetracyclo[6.5.2.02,7.09,13]pentadeca-2,4,6-triene-9-carboxylate
    —— methyl 4-[(2R)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate —— C27H22N2O8S
    methyl 4-[(2R)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate
    —— Methyl 2-chloro-7-(3-methoxyphenyl)-8-oxo-5-(3,4,5-trimethoxyphenyl)-1,7-naphthyridine-6-carboxylate —— C26H23ClN2O7
    Methyl 2-chloro-7-(3-methoxyphenyl)-8-oxo-5-(3,4,5-trimethoxyphenyl)-1,7-naphthyridine-6-carboxylate
    —— methyl 4-[[(2R)-2-(2,5-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O8
    methyl 4-[[(2R)-2-(2,5-dimethoxyphenyl)-1-(3-morpholin-4-ylpropyl)-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl 4-[[(2S)-2-(3-bromophenyl)-1-[2-(diethylamino)ethyl]-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C25H30BrN3O5
    methyl 4-[[(2S)-2-(3-bromophenyl)-1-[2-(diethylamino)ethyl]-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl 4-[[(2R)-2-(3-bromophenyl)-1-[2-(diethylamino)ethyl]-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C25H30BrN3O5
    methyl 4-[[(2R)-2-(3-bromophenyl)-1-[2-(diethylamino)ethyl]-4,5-dioxopyrrolidin-3-ylidene]-hydroxymethyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
    —— methyl 4-(4-fluorophenyl)-2-[[4-[(Z)-(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]benzoyl]amino]-1,3-thiazole-5-carboxylate —— C22H14FN3O4S3
    methyl 4-(4-fluorophenyl)-2-[[4-[(Z)-(4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]benzoyl]amino]-1,3-thiazole-5-carboxylate
    —— Methyl 7-(4-aminophenyl)-2-chloro-5-(4-chloro-3,5-dimethoxyphenyl)-8-oxo-1,7-naphthyridine-6-carboxylate —— C24H19Cl2N3O5
    Methyl 7-(4-aminophenyl)-2-chloro-5-(4-chloro-3,5-dimethoxyphenyl)-8-oxo-1,7-naphthyridine-6-carboxylate
    —— methyl 4-[(2S)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate —— C27H22N2O8S
    methyl 4-[(2S)-1-(5-acetyl-4-methyl-1,3-thiazol-2-yl)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate
    —— methyl 2-[(2S)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C26H22N2O8S
    methyl 2-[(2S)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
    —— methyl 2-[(2R)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C26H22N2O8S
    methyl 2-[(2R)-3-[hydroxy-(3-methoxyphenyl)methylidene]-2-(4-methoxycarbonylphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate