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二嗪烷类

中文名称 英文名称 CAS号 化学式 结构式图片
—— 1-[(3S,5S)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone —— C12H22N2O3S
1-[(3S,5S)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone
—— 1-[(3R,5R)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone —— C12H22N2O3S
1-[(3R,5R)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone
—— 1-[(3R,5S)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone —— C12H22N2O3S
1-[(3R,5S)-3-(1,1-dioxothian-4-yl)-5-methylpiperazin-1-yl]ethanone
—— 4-[5-(4-Fluorophenyl)thieno[2,3-d]pyrimidin-4-yl]piperazin-2-one —— C16H13FN4OS
4-[5-(4-Fluorophenyl)thieno[2,3-d]pyrimidin-4-yl]piperazin-2-one
—— 2-[[5-[(Z)-2-(4-fluorophenyl)ethenyl]-1H-1,2,4-triazol-3-yl]sulfanyl]-1-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]ethanone —— C23H21F4N5OS
2-[[5-[(Z)-2-(4-fluorophenyl)ethenyl]-1H-1,2,4-triazol-3-yl]sulfanyl]-1-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]ethanone
—— (Z)-3-(4-chlorophenyl)-N-[4-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]phenyl]prop-2-enamide —— C25H19ClF5N3O
(Z)-3-(4-chlorophenyl)-N-[4-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]phenyl]prop-2-enamide
—— [4-[(Z)-2-(4-chlorophenyl)ethenyl]sulfonylpiperazin-1-yl]-piperidin-1-ylmethanone —— C18H24ClN3O3S
[4-[(Z)-2-(4-chlorophenyl)ethenyl]sulfonylpiperazin-1-yl]-piperidin-1-ylmethanone
—— (Z)-3-[2-(4-fluorophenyl)-1,3-thiazol-4-yl]-1-[4-(pyrrolidine-1-carbonyl)piperazin-1-yl]prop-2-en-1-one —— C21H23FN4O2S
(Z)-3-[2-(4-fluorophenyl)-1,3-thiazol-4-yl]-1-[4-(pyrrolidine-1-carbonyl)piperazin-1-yl]prop-2-en-1-one
—— ethyl (2E,5S)-5-(3-methoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H33N5O6S
ethyl (2E,5S)-5-(3-methoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H30N5O5S+
ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (Z)-N-[4-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]phenyl]-3-(4-propan-2-ylphenyl)prop-2-enamide —— C28H26F5N3O
(Z)-N-[4-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]phenyl]-3-(4-propan-2-ylphenyl)prop-2-enamide
—— ethyl (2E,5S)-5-(2-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H32N5O6S+
ethyl (2E,5S)-5-(2-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H36N5O5S+
ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H31N5O7S
ethyl (2E,5S)-5-(1,3-benzodioxol-5-yl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (Z)-3-(furan-2-yl)-1-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]prop-2-en-1-one —— C17H13F5N2O2
(Z)-3-(furan-2-yl)-1-[4-(2,3,4,5,6-pentafluorophenyl)piperazin-1-yl]prop-2-en-1-one
—— ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H30N5O5S+
ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— 3-{[4-(4-Fluorophenyl)-1-piperazinyl]methyl}-5-[4-(hexyloxy)benzylidene]-1,3-thiazolidine-2,4-dione —— C27H32FN3O3S
3-{[4-(4-Fluorophenyl)-1-piperazinyl]methyl}-5-[4-(hexyloxy)benzylidene]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5R)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5-thiophen-2-yl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H30N5O5S2+
ethyl (2E,5R)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5-thiophen-2-yl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-5-(4-chlorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H29ClN5O5S+
ethyl (2E,5R)-5-(4-chlorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— 5-[2-(Allyloxy)benzylidene]-3-{[4-(3-chlorophenyl)-1-piperazinyl]methyl}-1,3-thiazolidine-2,4-dione —— C24H24ClN3O3S
5-[2-(Allyloxy)benzylidene]-3-{[4-(3-chlorophenyl)-1-piperazinyl]methyl}-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5S)-5-(3,4-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C30H33N5O7S
ethyl (2E,5S)-5-(3,4-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-5-(4-chlorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H29ClN5O5S+
ethyl (2E,5S)-5-(4-chlorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-5-(3,4-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C30H34N5O7S+
ethyl (2E,5R)-5-(3,4-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H34N5O5S2+
ethyl (2E,5S)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (Z)-3-[5-(3-chloro-2-methylphenyl)furan-2-yl]-N-[3-chloro-4-[4-(2-methylpropanoyl)piperazin-1-yl]phenyl]prop-2-enamide —— C28H29Cl2N3O3
(Z)-3-[5-(3-chloro-2-methylphenyl)furan-2-yl]-N-[3-chloro-4-[4-(2-methylpropanoyl)piperazin-1-yl]phenyl]prop-2-enamide
—— (Z)-3-(furan-2-yl)-1-[4-(4-nitro-3-piperidin-1-ylphenyl)piperazin-1-yl]prop-2-en-1-one —— C22H26N4O4
(Z)-3-(furan-2-yl)-1-[4-(4-nitro-3-piperidin-1-ylphenyl)piperazin-1-yl]prop-2-en-1-one
—— ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(3,4,5-trimethoxyphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H35N5O8S
ethyl (2E,5R)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(3,4,5-trimethoxyphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— 7-Chloro-4-[4-[2-[4-(7-chloroquinolin-1-ium-4-yl)piperazin-1-ium-1-yl]ethyl]piperazin-4-ium-1-yl]quinoline —— C28H33Cl2N6+3
7-Chloro-4-[4-[2-[4-(7-chloroquinolin-1-ium-4-yl)piperazin-1-ium-1-yl]ethyl]piperazin-4-ium-1-yl]quinoline
—— 4-[2-[(Z)-2-phenylethenyl]-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-yl]piperazine-1-sulfonamide —— C22H25N5O2S2
4-[2-[(Z)-2-phenylethenyl]-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-yl]piperazine-1-sulfonamide
—— ethyl (2E,5R)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H34N5O5S2+
ethyl (2E,5R)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(3,4,5-trimethoxyphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H36N5O8S+
ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(3,4,5-trimethoxyphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (9aS)-2-[3-[4-(2-butoxyphenyl)piperazin-1-yl]propyl]-3,6,7,8,9,9a-hexahydropyrido[1,2-a]pyrazine-1,4-dione —— C25H38N4O3
(9aS)-2-[3-[4-(2-butoxyphenyl)piperazin-1-yl]propyl]-3,6,7,8,9,9a-hexahydropyrido[1,2-a]pyrazine-1,4-dione
—— ethyl (2E,5S)-5-(4-fluorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H29FN5O5S+
ethyl (2E,5S)-5-(4-fluorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H33N5O5S2
ethyl (2E,5R)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-5-(4-methylsulfanylphenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (5E)-5-[(2-butoxyphenyl)methylidene]-3-[(4-phenylpiperazin-1-ium-1-yl)methyl]-1,3-thiazolidine-2,4-dione —— C25H30N3O3S+
(5E)-5-[(2-butoxyphenyl)methylidene]-3-[(4-phenylpiperazin-1-ium-1-yl)methyl]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5R)-5-(4-methoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H33N5O6S
ethyl (2E,5R)-5-(4-methoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-5-(2-methoxyphenyl)-2-[[5-(4-methylpiperazin-1-yl)furan-2-yl]methylidene]-3-oxo-7-propyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H34N4O5S
ethyl (2E,5S)-5-(2-methoxyphenyl)-2-[[5-(4-methylpiperazin-1-yl)furan-2-yl]methylidene]-3-oxo-7-propyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H36N5O5S+
ethyl (2E,5S)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-5-(4-fluorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H28FN5O5S
ethyl (2E,5R)-5-(4-fluorophenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— 5-(2-Butoxybenzylidene)-3-[(4-phenyl-1-piperazinyl)methyl]-1,3-thiazolidine-2,4-dione —— C25H29N3O3S
5-(2-Butoxybenzylidene)-3-[(4-phenyl-1-piperazinyl)methyl]-1,3-thiazolidine-2,4-dione
—— 5-(2-Butoxybenzylidene)-3-{[4-(4-methylphenyl)-1-piperazinyl]methyl}-1,3-thiazolidine-2,4-dione —— C26H31N3O3S
5-(2-Butoxybenzylidene)-3-{[4-(4-methylphenyl)-1-piperazinyl]methyl}-1,3-thiazolidine-2,4-dione
—— (5E)-5-[(4-butoxyphenyl)methylidene]-3-[[4-(2-methylphenyl)piperazin-1-ium-1-yl]methyl]-1,3-thiazolidine-2,4-dione —— C26H32N3O3S+
(5E)-5-[(4-butoxyphenyl)methylidene]-3-[[4-(2-methylphenyl)piperazin-1-ium-1-yl]methyl]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5R)-5-(2,5-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C30H33N5O7S
ethyl (2E,5R)-5-(2,5-dimethoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (5E)-3-[[4-(4-methylphenyl)piperazin-1-ium-1-yl]methyl]-5-[(4-propoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione —— C25H30N3O3S+
(5E)-3-[[4-(4-methylphenyl)piperazin-1-ium-1-yl]methyl]-5-[(4-propoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5S)-5-(4-chlorophenyl)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C33H31ClN5O5S+
ethyl (2E,5S)-5-(4-chlorophenyl)-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (5E)-3-[[4-(3-chlorophenyl)piperazin-1-ium-1-yl]methyl]-5-[(2-prop-2-enoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione —— C24H25ClN3O3S+
(5E)-3-[[4-(3-chlorophenyl)piperazin-1-ium-1-yl]methyl]-5-[(2-prop-2-enoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5R)-5-(4-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H31N5O6S
ethyl (2E,5R)-5-(4-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— (5E)-3-[[4-(3-chloro-4-methylphenyl)piperazin-1-ium-1-yl]methyl]-5-[(2-prop-2-enoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione —— C25H27ClN3O3S+
(5E)-3-[[4-(3-chloro-4-methylphenyl)piperazin-1-ium-1-yl]methyl]-5-[(2-prop-2-enoxyphenyl)methylidene]-1,3-thiazolidine-2,4-dione
—— ethyl (2E,5S)-5-(4-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H32N5O6S+
ethyl (2E,5S)-5-(4-methoxyphenyl)-7-methyl-2-[[2-(4-methylpiperazin-4-ium-1-yl)-5-nitrophenyl]methylidene]-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
—— ethyl (2E,5R)-5-(3,4-dimethoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C35H35N5O7S
ethyl (2E,5R)-5-(3,4-dimethoxyphenyl)-2-[[2-(4-methylpiperazin-1-yl)-5-nitrophenyl]methylidene]-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate