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中文名称 英文名称 CAS号 化学式 结构式图片
—— methyl 4-[(1S)-1-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-methoxy-3-oxopropyl]benzoate —— C27H22O11
methyl 4-[(1S)-1-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-methoxy-3-oxopropyl]benzoate
—— methyl 4-[(1R)-1-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-methoxy-3-oxopropyl]benzoate —— C27H22O11
methyl 4-[(1R)-1-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-methoxy-3-oxopropyl]benzoate
—— methyl (3R)-3-[3-(difluoromethoxy)phenyl]-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]propanoate —— C26H20F2O10
methyl (3R)-3-[3-(difluoromethoxy)phenyl]-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]propanoate
—— methyl (3S)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(11-oxo-1-azatricyclo[6.3.1.04,12]dodeca-4,6,8(12),9-tetraen-10-yl)propanoate —— C32H27NO7
methyl (3S)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(11-oxo-1-azatricyclo[6.3.1.04,12]dodeca-4,6,8(12),9-tetraen-10-yl)propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(4-methoxynaphthalen-1-yl)propanoate —— C30H24O10
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(4-methoxynaphthalen-1-yl)propanoate
—— methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-(7-methoxy-1-methyl-2-oxoquinolin-3-yl)propanoate —— C30H25NO8
methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-(7-methoxy-1-methyl-2-oxoquinolin-3-yl)propanoate
—— methyl (3S)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(6-methoxy-4-oxochromen-3-yl)propanoate —— C31H26O9
methyl (3S)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(6-methoxy-4-oxochromen-3-yl)propanoate
—— methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[6-methoxy-1-(2-methylpropyl)-2-oxoquinolin-3-yl]propanoate —— C33H31NO8
methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[6-methoxy-1-(2-methylpropyl)-2-oxoquinolin-3-yl]propanoate
—— methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(7-methoxy-1,3-benzodioxol-5-yl)propanoate —— C27H22O12
methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(7-methoxy-1,3-benzodioxol-5-yl)propanoate
—— methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-(2-phenylethoxy)phenyl]propanoate —— C33H28O7
methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-(2-phenylethoxy)phenyl]propanoate
—— methyl (3S)-3-[7-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-8-yl]-3-[4-[2-(4-methoxyphenyl)ethoxy]phenyl]propanoate —— C34H30O8
methyl (3S)-3-[7-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-8-yl]-3-[4-[2-(4-methoxyphenyl)ethoxy]phenyl]propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[3-methoxy-4-(2-phenylethoxy)phenyl]propanoate —— C34H30O11
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[3-methoxy-4-(2-phenylethoxy)phenyl]propanoate
—— methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(2,3,4-trimethoxyphenyl)propanoate —— C28H26O12
methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(2,3,4-trimethoxyphenyl)propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(2-oxo-1-azatricyclo[7.3.1.05,13]trideca-3,5(13),6,8-tetraen-3-yl)propanoate —— C31H25NO10
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(2-oxo-1-azatricyclo[7.3.1.05,13]trideca-3,5(13),6,8-tetraen-3-yl)propanoate
—— methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[3-methoxy-4-(2-phenylethoxy)phenyl]propanoate —— C34H30O8
methyl (3R)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[3-methoxy-4-(2-phenylethoxy)phenyl]propanoate
—— methyl (3R)-3-[4-[2-(2,3-dihydro-1-benzofuran-5-yl)ethoxy]phenyl]-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate —— C35H30O8
methyl (3R)-3-[4-[2-(2,3-dihydro-1-benzofuran-5-yl)ethoxy]phenyl]-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate
—— methyl (1S,4aR,7aS)-7-(hydroxymethyl)-1-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(E)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoyl]oxymethyl]oxan-2-yl]oxy-1,4a,5,7a-tetrahydrocyclopenta[c]pyran-4-carboxylate —— C27H32O13
methyl (1S,4aR,7aS)-7-(hydroxymethyl)-1-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(E)-3-(4-hydroxy-3-methoxyphenyl)prop-2-enoyl]oxymethyl]oxan-2-yl]oxy-1,4a,5,7a-tetrahydrocyclopenta[c]pyran-4-carboxylate
—— methyl (3S)-3-(3-bromophenyl)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]propanoate —— C25H19BrO9
methyl (3S)-3-(3-bromophenyl)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]propanoate
—— methyl (3S)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-methoxy-3-(2-methoxy-2-oxoethoxy)phenyl]propanoate —— C29H26O10
methyl (3S)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-methoxy-3-(2-methoxy-2-oxoethoxy)phenyl]propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(7-methoxy-1,3-benzodioxol-5-yl)propanoate —— C27H22O12
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(7-methoxy-1,3-benzodioxol-5-yl)propanoate
—— methyl 2-[4-(2-oxo-1,3,4,5-tetrahydrobenzo[cd]indol-2a-yl)butyl]-3,4-dihydro-1H-pyrido[3,4-b]indole-9-carboxylate —— C28H31N3O3
methyl 2-[4-(2-oxo-1,3,4,5-tetrahydrobenzo[cd]indol-2a-yl)butyl]-3,4-dihydro-1H-pyrido[3,4-b]indole-9-carboxylate
—— methyl (3S)-3-[4-[2-(2,3-dihydro-1-benzofuran-5-yl)ethoxy]phenyl]-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate —— C35H30O8
methyl (3S)-3-[4-[2-(2,3-dihydro-1-benzofuran-5-yl)ethoxy]phenyl]-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate
—— methyl (3R)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(3,4,5-trimethoxyphenyl)propanoate —— C30H30O9
methyl (3R)-3-[7-methoxy-3-(4-methoxyphenyl)-4-oxochromen-8-yl]-3-(3,4,5-trimethoxyphenyl)propanoate
—— methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(5-methoxy-2,3-dihydro-1,4-benzodioxin-7-yl)propanoate —— C28H24O12
methyl (3R)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(5-methoxy-2,3-dihydro-1,4-benzodioxin-7-yl)propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[3-methoxy-4-(2-methylpropoxy)phenyl]propanoate —— C30H30O11
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[3-methoxy-4-(2-methylpropoxy)phenyl]propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(3-methoxy-4-propan-2-yloxyphenyl)propanoate —— C29H28O11
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-(3-methoxy-4-propan-2-yloxyphenyl)propanoate
—— methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[4-[2-(4-methoxyphenyl)ethoxy]phenyl]propanoate —— C34H30O11
methyl (3S)-3-[2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4-oxochromen-8-yl]-3-[4-[2-(4-methoxyphenyl)ethoxy]phenyl]propanoate
—— methyl (3S)-3-(6-bromo-4H-1,3-benzodioxin-8-yl)-3-[7-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-8-yl]propanoate —— C27H21BrO8
methyl (3S)-3-(6-bromo-4H-1,3-benzodioxin-8-yl)-3-[7-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-8-yl]propanoate
—— methyl (3S)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-(2-phenylethoxy)phenyl]propanoate —— C33H28O7
methyl (3S)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)-3-[4-(2-phenylethoxy)phenyl]propanoate
—— MeOCO-Pro-DL-Arg-benzothiazol-2-yl —— C20H26N6O4S
MeOCO-Pro-DL-Arg-benzothiazol-2-yl
—— Methyl 2-ethyl-6-methoxy-5-[[[4-(4-methylphenyl)piperazin-1-yl]-methylsulfanylmethylidene]amino]pyridine-3-carboxylate —— C23H30N4O3S
Methyl 2-ethyl-6-methoxy-5-[[[4-(4-methylphenyl)piperazin-1-yl]-methylsulfanylmethylidene]amino]pyridine-3-carboxylate
—— methyl N-[[1-[2-(diethylamino)ethylamino]-6-methoxy-9-oxothioxanthen-4-yl]methyl]carbamate —— C23H29N3O4S
methyl N-[[1-[2-(diethylamino)ethylamino]-6-methoxy-9-oxothioxanthen-4-yl]methyl]carbamate
—— methyl 4-[hydroxy-[(2S)-1-(2-morpholin-4-ylethyl)-4,5-dioxo-2-(3,4,5-trimethoxyphenyl)pyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O9
methyl 4-[hydroxy-[(2S)-1-(2-morpholin-4-ylethyl)-4,5-dioxo-2-(3,4,5-trimethoxyphenyl)pyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
—— methyl 4-[hydroxy-[(2R)-1-(2-morpholin-4-ylethyl)-4,5-dioxo-2-(3,4,5-trimethoxyphenyl)pyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate —— C28H35N3O9
methyl 4-[hydroxy-[(2R)-1-(2-morpholin-4-ylethyl)-4,5-dioxo-2-(3,4,5-trimethoxyphenyl)pyrrolidin-3-ylidene]methyl]-3,5-dimethyl-1H-pyrrole-2-carboxylate
—— methyl 2-[3-[[(2S)-2-amino-3-[[(2R)-2,3-dihydroxypropoxy]-hydroxyphosphoryl]oxypropanoyl]amino]-2-oxoazepan-1-yl]acetate —— C15H28N3O10P
methyl 2-[3-[[(2S)-2-amino-3-[[(2R)-2,3-dihydroxypropoxy]-hydroxyphosphoryl]oxypropanoyl]amino]-2-oxoazepan-1-yl]acetate
—— Methyl 1-[4-[[2-butyl-5-chloro-4-(hydroxymethyl)imidazol-1-yl]methyl]phenyl]-5-chloropyrrole-2-carboxylate —— C21H23Cl2N3O3
Methyl 1-[4-[[2-butyl-5-chloro-4-(hydroxymethyl)imidazol-1-yl]methyl]phenyl]-5-chloropyrrole-2-carboxylate
—— methyl 2-[(2R)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methyl-4-phenylmethoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C35H34N2O6S
methyl 2-[(2R)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methyl-4-phenylmethoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-[3-(3-methylbutoxy)phenyl]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2S)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-[3-(3-methylbutoxy)phenyl]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2R)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2R)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-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-(3-methylbutoxy)phenyl]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2R)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-[3-(3-methylbutoxy)phenyl]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2R)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H23BrN2O8S
methyl 2-[(2R)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2S)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methyl-4-phenylmethoxyphenyl)methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C35H34N2O6S
methyl 2-[(2S)-2-(4-tert-butylphenyl)-3-[hydroxy-(3-methyl-4-phenylmethoxyphenyl)methylidene]-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-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C34H30N2O9S
methyl 2-[(2R)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-(3-ethoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2R)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H23BrN2O8S
methyl 2-[(2R)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 4-[(2S)-1-[5-[(4-chlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate —— C31H24ClN3O6S2
methyl 4-[(2S)-1-[5-[(4-chlorophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-3-[hydroxy-[(2S)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-2-yl]benzoate
—— methyl 2-[(2R)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2R)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C27H23BrN2O8S
methyl 2-[(2S)-2-(3-bromo-4-hydroxy-5-methoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-(3-ethoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C34H30N2O9S
methyl 2-[(2S)-3-[2,3-dihydro-1,4-benzodioxin-6-yl(hydroxy)methylidene]-2-(3-ethoxy-4-phenylmethoxyphenyl)-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate
—— methyl 2-[(2S)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate —— C30H30N2O8S
methyl 2-[(2S)-2-(3,4-diethoxyphenyl)-3-[hydroxy-[(2R)-2-methyl-2,3-dihydro-1-benzofuran-5-yl]methylidene]-4,5-dioxopyrrolidin-1-yl]-4-methyl-1,3-thiazole-5-carboxylate