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    —— ethyl (2Z)-2-[[2-(cyanomethoxy)phenyl]methylidene]-5-(4-fluorophenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C30H22FN3O4S
    ethyl (2Z)-2-[[2-(cyanomethoxy)phenyl]methylidene]-5-(4-fluorophenyl)-3-oxo-7-phenyl-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-(3-bromo-4-hydroxy-5-methoxybenzylidene)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C25H23BrN2O7S
    ethyl (2E)-2-(3-bromo-4-hydroxy-5-methoxybenzylidene)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-2-{2-[(2-fluorobenzyl)oxy]benzylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C33H31FN2O4S
    ethyl (2Z)-2-{2-[(2-fluorobenzyl)oxy]benzylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-[2-(2,4-dimethoxyphenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate —— C26H24N2O5
    (E)-[2-(2,4-dimethoxyphenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate
    —— Ethyl (2E)-2-{[5-(dimethylamino)furan-2-YL]methylidene}-5-(4-fluorophenyl)-7-methyl-3-oxo-2H,3H,5H-[1,3]thiazolo[3,2-A]pyrimidine-6-carboxylate —— C23H22FN3O4S
    Ethyl (2E)-2-{[5-(dimethylamino)furan-2-YL]methylidene}-5-(4-fluorophenyl)-7-methyl-3-oxo-2H,3H,5H-[1,3]thiazolo[3,2-A]pyrimidine-6-carboxylate
    —— ethyl (2S)-2-cyano-3-(4-methoxy-3-propan-2-ylphenyl)-2-methylpropanoate —— C17H23NO3
    ethyl (2S)-2-cyano-3-(4-methoxy-3-propan-2-ylphenyl)-2-methylpropanoate
    —— ethyl (2R)-2-cyano-3-(4-methoxy-3-propan-2-ylphenyl)-2-methylpropanoate —— C17H23NO3
    ethyl (2R)-2-cyano-3-(4-methoxy-3-propan-2-ylphenyl)-2-methylpropanoate
    —— (E)-[2-(4-chlorophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate —— C24H19ClN2O3
    (E)-[2-(4-chlorophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate
    —— (E)-{2-(4-bromophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C21H21BrN2O3
    (E)-{2-(4-bromophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— ethyl (2R)-2-cyano-3-(2-methoxy-5-propan-2-ylphenyl)-2-methylpropanoate —— C17H23NO3
    ethyl (2R)-2-cyano-3-(2-methoxy-5-propan-2-ylphenyl)-2-methylpropanoate
    —— ethyl (2Z)-2-{3,5-dichloro-4-[(2-cyanobenzyl)oxy]benzylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H29Cl2N3O4S
    ethyl (2Z)-2-{3,5-dichloro-4-[(2-cyanobenzyl)oxy]benzylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-2-[3-bromo-5-ethoxy-4-(prop-2-yn-1-yloxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C31H31BrN2O5S
    ethyl (2Z)-2-[3-bromo-5-ethoxy-4-(prop-2-yn-1-yloxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-{2-(2,4-dimethoxyphenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C23H26N2O5
    (E)-{2-(2,4-dimethoxyphenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— ethyl (2Z)-2-[3-bromo-4-(2-methoxy-2-oxoethoxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H29BrN2O6S
    ethyl (2Z)-2-[3-bromo-4-(2-methoxy-2-oxoethoxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-{1-[2-(dimethylammonio)ethyl]-2-(3-fluorophenyl)-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C21H21FN2O3
    (E)-{1-[2-(dimethylammonio)ethyl]-2-(3-fluorophenyl)-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— ethyl (2E)-2-[(3,5-dichloroanilino)methylidene]-3-oxobutanoate —— C13H13Cl2NO3
    ethyl (2E)-2-[(3,5-dichloroanilino)methylidene]-3-oxobutanoate
    —— ethyl (2Z)-2-{[1-(3,5-dimethylphenyl)-2,5-dimethyl-1H-pyrrol-3-yl]methylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H37N3O3S
    ethyl (2Z)-2-{[1-(3,5-dimethylphenyl)-2,5-dimethyl-1H-pyrrol-3-yl]methylidene}-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-[(1,5-dimethylpyrazol-4-yl)methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C23H24N4O4S
    ethyl (2E)-2-[(1,5-dimethylpyrazol-4-yl)methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-{2-(2,4-dichlorophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C21H20Cl2N2O3
    (E)-{2-(2,4-dichlorophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— (E)-(4-methylphenyl)[2-(3-nitrophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene]methanolate —— C24H19N3O5
    (E)-(4-methylphenyl)[2-(3-nitrophenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene]methanolate
    —— ethyl (2E)-5-(4-chlorophenyl)-2-[(1,5-dimethyl-1H-pyrazol-4-yl)methylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C22H21ClN4O3S
    ethyl (2E)-5-(4-chlorophenyl)-2-[(1,5-dimethyl-1H-pyrazol-4-yl)methylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-[(3-fluorophenyl)methylidene]-5-(3-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H21FN2O4S
    ethyl (2E)-2-[(3-fluorophenyl)methylidene]-5-(3-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2-(2,3,4-trimethoxybenzylidene)-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C27H28N2O8S
    ethyl (2E)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2-(2,3,4-trimethoxybenzylidene)-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-[4-(dimethylamino)benzylidene]-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C26H27N3O5S
    ethyl (2E)-2-[4-(dimethylamino)benzylidene]-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-2-(3-nitrobenzylidene)-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H21N3O7S
    ethyl (2E)-7-(4-hydroxy-3-methoxyphenyl)-5-methyl-2-(3-nitrobenzylidene)-3-oxo-2,3-dihydro-7H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-[2-(4-methoxyphenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate —— C25H22N2O4
    (E)-[2-(4-methoxyphenyl)-4,5-dioxo-1-(pyridinium-3-ylmethyl)pyrrolidin-3-ylidene](4-methylphenyl)methanolate
    —— (E)-{1-(3-carboxypropyl)-2-[4-(dimethylammonio)phenyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C23H24N2O5
    (E)-{1-(3-carboxypropyl)-2-[4-(dimethylammonio)phenyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— (E)-{2-(2-chlorophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate —— C21H21ClN2O3
    (E)-{2-(2-chlorophenyl)-1-[2-(dimethylammonio)ethyl]-4,5-dioxopyrrolidin-3-ylidene}(phenyl)methanolate
    —— ethyl (2E)-5-[4-(dimethylamino)phenyl]-7-methyl-2-[(6-methylquinolin-2-yl)methylidene]-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H28N4O3S
    ethyl (2E)-5-[4-(dimethylamino)phenyl]-7-methyl-2-[(6-methylquinolin-2-yl)methylidene]-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-5-[4-(dimethylamino)phenyl]-2-[4-(3,5-diphenyl-4,5-dihydro-1H-pyrazol-1-yl)benzylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C40H37N5O3S
    ethyl (2E)-5-[4-(dimethylamino)phenyl]-2-[4-(3,5-diphenyl-4,5-dihydro-1H-pyrazol-1-yl)benzylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl 2-(9-anthrylmethylene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C34H30N2O3S
    ethyl 2-(9-anthrylmethylene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-3-[4-(dimethylamino)phenyl]-2-propenal 1-(1,1-dioxo-1H-1,2-benzisothiazol-3-yl)hydrazone —— C18H18N4O2S
    (E)-3-[4-(dimethylamino)phenyl]-2-propenal 1-(1,1-dioxo-1H-1,2-benzisothiazol-3-yl)hydrazone
    —— (E)-(4-bromophenyl){1-[2-(diethylammonio)ethyl]-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-3-ylidene}methanolate —— C23H24BrN3O5
    (E)-(4-bromophenyl){1-[2-(diethylammonio)ethyl]-2-(4-nitrophenyl)-4,5-dioxopyrrolidin-3-ylidene}methanolate
    —— ethyl 2-(2,5-dimethoxybenzylidene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H30N2O5S
    ethyl 2-(2,5-dimethoxybenzylidene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-5-(2,4-dimethoxyphenyl)-2-[(1,5-dimethyl-1H-pyrazol-4-yl)methylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C24H26N4O5S
    ethyl (2E)-5-(2,4-dimethoxyphenyl)-2-[(1,5-dimethyl-1H-pyrazol-4-yl)methylidene]-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-5-(1,3-benzodioxol-5-yl)-2-(2-bromo-4-hydroxy-5-methoxybenzylidene)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C25H21BrN2O7S
    ethyl (2E)-5-(1,3-benzodioxol-5-yl)-2-(2-bromo-4-hydroxy-5-methoxybenzylidene)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— (E)-(4-chlorophenyl)-[1-[2-(diethylazaniumyl)ethyl]-2-(4-fluorophenyl)-4,5-dioxopyrrolidin-3-ylidene]methanolate —— C23H24ClFN2O3
    (E)-(4-chlorophenyl)-[1-[2-(diethylazaniumyl)ethyl]-2-(4-fluorophenyl)-4,5-dioxopyrrolidin-3-ylidene]methanolate
    —— ethyl (2Z)-7-methyl-3-oxo-2-{[5-(piperidin-1-yl)furan-2-yl]methylidene}-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H33N3O4S
    ethyl (2Z)-7-methyl-3-oxo-2-{[5-(piperidin-1-yl)furan-2-yl]methylidene}-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-5-(4-methoxyphenyl)-7-methyl-2-[(6-methylquinolin-2-yl)methylidene]-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H25N3O4S
    ethyl (2E)-5-(4-methoxyphenyl)-7-methyl-2-[(6-methylquinolin-2-yl)methylidene]-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-[[5-(4-acetylphenyl)furan-2-yl]methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C30H26N2O6S
    ethyl (2E)-2-[[5-(4-acetylphenyl)furan-2-yl]methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl 5-(carbamothioylhydrazinylidene)-2-methylindeno[1,2-b]pyridine-3-carboxylate —— C17H16N4O2S
    ethyl 5-(carbamothioylhydrazinylidene)-2-methylindeno[1,2-b]pyridine-3-carboxylate
    —— ethyl (2Z)-2-[3-bromo-5-methoxy-4-(naphthalen-1-ylmethoxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C38H35BrN2O5S
    ethyl (2Z)-2-[3-bromo-5-methoxy-4-(naphthalen-1-ylmethoxy)benzylidene]-7-methyl-3-oxo-5-[4-(propan-2-yl)phenyl]-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl 2-(4-chlorobenzylidene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C26H25ClN2O3S
    ethyl 2-(4-chlorobenzylidene)-5-(4-isopropylphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-2-[[4-(diethylamino)-2-hydroxyphenyl]methylidene]-5-(3-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H31N3O5S
    ethyl (2Z)-2-[[4-(diethylamino)-2-hydroxyphenyl]methylidene]-5-(3-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-2-[[1-(4-chlorophenyl)-2,5-dimethylpyrrol-3-yl]methylidene]-7-methyl-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C32H32ClN3O3S
    ethyl (2Z)-2-[[1-(4-chlorophenyl)-2,5-dimethylpyrrol-3-yl]methylidene]-7-methyl-3-oxo-5-(4-propan-2-ylphenyl)-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl 4-{2-(2-chlorophenyl)-4-hydroxy-3-[(4-methoxyphenyl)carbonyl]-5-oxo-2,5-dihydro-1H-pyrrol-1-yl}benzoate —— C27H22ClNO6
    ethyl 4-{2-(2-chlorophenyl)-4-hydroxy-3-[(4-methoxyphenyl)carbonyl]-5-oxo-2,5-dihydro-1H-pyrrol-1-yl}benzoate
    —— ethyl (2Z)-2-[[5-(2-chloro-5-nitrophenyl)furan-2-yl]methylidene]-5-(2-chlorophenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C27H19Cl2N3O6S
    ethyl (2Z)-2-[[5-(2-chloro-5-nitrophenyl)furan-2-yl]methylidene]-5-(2-chlorophenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-5-(2-chlorophenyl)-2-{[1-(3,4-dichlorophenyl)-2,5-dimethyl-1H-pyrrol-3-yl]methylidene}-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C29H24Cl3N3O3S
    ethyl (2Z)-5-(2-chlorophenyl)-2-{[1-(3,4-dichlorophenyl)-2,5-dimethyl-1H-pyrrol-3-yl]methylidene}-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2Z)-5-(2-chlorophenyl)-2-[[5-(2-methoxy-4-nitrophenyl)furan-2-yl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H22ClN3O7S
    ethyl (2Z)-5-(2-chlorophenyl)-2-[[5-(2-methoxy-4-nitrophenyl)furan-2-yl]methylidene]-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate
    —— ethyl (2E)-2-{[5-(3,4-dichlorophenyl)-2-furyl]methylene}-5-(4-methoxyphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate —— C28H22Cl2N2O5S
    ethyl (2E)-2-{[5-(3,4-dichlorophenyl)-2-furyl]methylene}-5-(4-methoxyphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate