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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 吡啶并嘧啶类

    吡啶并嘧啶类

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 2-(2-fluorophenoxy)-1-[(1S,9S)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]ethanone —— C18H18FN3O2
    2-(2-fluorophenoxy)-1-[(1S,9S)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]ethanone
    —— (1S,9S)-12-[(4-chloro-3-fluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17ClFN3
    (1S,9S)-12-[(4-chloro-3-fluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (2,4-dimethyl-1,3-thiazol-5-yl)-[(1R,9R)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]methanone —— C16H18N4OS
    (2,4-dimethyl-1,3-thiazol-5-yl)-[(1R,9R)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]methanone
    —— (1S,9S)-5-methyl-12-[(4-propan-2-yloxyphenyl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C20H25N3O
    (1S,9S)-5-methyl-12-[(4-propan-2-yloxyphenyl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-5-methyl-12-[(5-propylthiophen-2-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C18H23N3S
    (1R,9R)-5-methyl-12-[(5-propylthiophen-2-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(2,4-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C19H23N3O2
    (1R,9R)-12-[(2,4-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(3,4-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17F2N3
    (1R,9R)-12-[(3,4-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-12-[(3-methoxy-4-propan-2-yloxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C21H27N3O2
    (1S,9S)-12-[(3-methoxy-4-propan-2-yloxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(3,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17F2N3
    (1R,9R)-12-[(3,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-5-methyl-12-(quinolin-8-ylmethyl)-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C20H20N4
    (1R,9R)-5-methyl-12-(quinolin-8-ylmethyl)-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-5-methyl-12-[(3-methyl-1-prop-2-enylpyrazol-4-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C18H23N5
    (1R,9R)-5-methyl-12-[(3-methyl-1-prop-2-enylpyrazol-4-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-12-[(3,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17F2N3
    (1S,9S)-12-[(3,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(2,3-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C19H23N3O2
    (1R,9R)-12-[(2,3-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (2,4-dimethyl-1,3-thiazol-5-yl)-[(1S,9S)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]methanone —— C16H18N4OS
    (2,4-dimethyl-1,3-thiazol-5-yl)-[(1S,9S)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]methanone
    —— (1R,9R)-12-[(4-methoxy-2,5-dimethylphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C20H25N3O
    (1R,9R)-12-[(4-methoxy-2,5-dimethylphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-12-[(2,4-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C19H23N3O2
    (1S,9S)-12-[(2,4-dimethoxyphenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-5-methyl-12-[(1-methylindol-3-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C20H22N4
    (1S,9S)-5-methyl-12-[(1-methylindol-3-yl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— 2-(2-fluorophenoxy)-1-[(1R,9R)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]ethanone —— C18H18FN3O2
    2-(2-fluorophenoxy)-1-[(1R,9R)-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-trien-12-yl]ethanone
    —— (1S,9S)-12-[(2,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17Cl2N3
    (1S,9S)-12-[(2,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(3,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17Cl2N3
    (1R,9R)-12-[(3,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1R,9R)-12-[(2,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17Cl2N3
    (1R,9R)-12-[(2,4-dichlorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-12-[(2,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C17H17F2N3
    (1S,9S)-12-[(2,5-difluorophenyl)methyl]-5-methyl-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— (1S,9S)-5-methyl-12-[(4-propan-2-ylphenyl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene —— C20H25N3
    (1S,9S)-5-methyl-12-[(4-propan-2-ylphenyl)methyl]-4,6,12-triazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
    —— 10-[(E)-2-[(2,5-dimethoxyphenyl)amino]ethenyl]-2,3,7,11-tetraazatricyclo[7.4.0.0^{2,6}]trideca-1(9),3,5,7,10,12-hexaene-5-carbonitrile —— C20H16N6O2
    10-[(E)-2-[(2,5-dimethoxyphenyl)amino]ethenyl]-2,3,7,11-tetraazatricyclo[7.4.0.0^{2,6}]trideca-1(9),3,5,7,10,12-hexaene-5-carbonitrile
    —— ethyl 1-(9-methyl-4-oxo-3-{(Z)-[4-oxo-3-(tetrahydrofuran-2-ylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxylate —— C26H30N4O5S2
    ethyl 1-(9-methyl-4-oxo-3-{(Z)-[4-oxo-3-(tetrahydrofuran-2-ylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxylate
    —— 9-methyl-3-{(Z)-[4-oxo-3-(tetrahydrofuran-2-ylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H30N4O4S2
    9-methyl-3-{(Z)-[4-oxo-3-(tetrahydrofuran-2-ylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-[(Z)-(3-cyclohexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-[(2-hydroxy-2-phenylethyl)amino]-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C27H28N4O3S2
    3-[(Z)-(3-cyclohexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-[(2-hydroxy-2-phenylethyl)amino]-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-[(Z)-(3-Cyclopentyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-9-methyl-2-[(tetrahydro-2-furanylmethyl)amino]-4H-pyrido[1,2-A]pyrimidin-4-one —— C23H26N4O3S2
    3-[(Z)-(3-Cyclopentyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-9-methyl-2-[(tetrahydro-2-furanylmethyl)amino]-4H-pyrido[1,2-A]pyrimidin-4-one
    —— 3-{(Z)-[3-(1,1-dioxidotetrahydrothiophen-3-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H28N4O5S3
    3-{(Z)-[3-(1,1-dioxidotetrahydrothiophen-3-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (Z)-4-(5-((2-((3-(1H-imidazol-1-yl)propyl)amino)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)methylene)-4-oxo-2-thioxothiazolidin-3-yl)butanoic acid —— C23H24N6O4S2
    (Z)-4-(5-((2-((3-(1H-imidazol-1-yl)propyl)amino)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)methylene)-4-oxo-2-thioxothiazolidin-3-yl)butanoic acid
    —— (Z)-5-((9-methyl-2-morpholino-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)methylene)-3-((tetrahydrofuran-2-yl)methyl)-2-thioxothiazolidin-4-one —— C22H24N4O4S2
    (Z)-5-((9-methyl-2-morpholino-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)methylene)-3-((tetrahydrofuran-2-yl)methyl)-2-thioxothiazolidin-4-one
    —— 2-(dipropylamino)-3-{(Z)-[3-(furan-2-ylmethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H26N4O3S2
    2-(dipropylamino)-3-{(Z)-[3-(furan-2-ylmethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-[(Z)-(3-hexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-{[2-(2-hydroxyethoxy)ethyl]amino}-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H30N4O4S2
    3-[(Z)-(3-hexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-{[2-(2-hydroxyethoxy)ethyl]amino}-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (2E)-2-cyano-3-[9-methyl-2-(3-methylpiperidin-1-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]-N-(2-phenylethyl)prop-2-enamide —— C27H29N5O2
    (2E)-2-cyano-3-[9-methyl-2-(3-methylpiperidin-1-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]-N-(2-phenylethyl)prop-2-enamide
    —— 2-[(2-hydroxy-2-phenylethyl)amino]-3-{(Z)-[4-oxo-3-(1-phenylethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C28H24N4O3S2
    2-[(2-hydroxy-2-phenylethyl)amino]-3-{(Z)-[4-oxo-3-(1-phenylethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[3-(1H-imidazol-1-yl)propyl]amino}-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C26H23FN6O2S2
    3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[3-(1H-imidazol-1-yl)propyl]amino}-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-[(3-methoxypropyl)amino]-9-methyl-3-{(Z)-[4-oxo-3-(3-phenylpropyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C26H28N4O3S2
    2-[(3-methoxypropyl)amino]-9-methyl-3-{(Z)-[4-oxo-3-(3-phenylpropyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (2E)-3-[2-(2,6-dimethylmorpholin-4-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]-2-(phenylsulfonyl)prop-2-enenitrile —— C24H24N4O4S
    (2E)-3-[2-(2,6-dimethylmorpholin-4-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]-2-(phenylsulfonyl)prop-2-enenitrile
    —— 3-[(Z)-{3-[2-(4-methoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-9-methyl-2-(propylamino)-4H-pyrido[1,2-a]pyrimidin-4-one —— C25H26N4O3S2
    3-[(Z)-{3-[2-(4-methoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-9-methyl-2-(propylamino)-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (2E)-2-(1-methyl-1H-benzimidazol-2-yl)-3-[4-oxo-2-(piperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enenitrile —— C24H22N6O
    (2E)-2-(1-methyl-1H-benzimidazol-2-yl)-3-[4-oxo-2-(piperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enenitrile
    —— 3-[(Z)-{3-[2-(3,4-dimethoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-2-[(2-methoxyethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one —— C25H26N4O5S2
    3-[(Z)-{3-[2-(3,4-dimethoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-2-[(2-methoxyethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 9-Methyl-2-{[3-(4-morpholinyl)propyl]amino}-3-{(Z)-[4-oxo-3-(tetrahydro-2-furanylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-A]pyrimidin-4-one —— C25H31N5O4S2
    9-Methyl-2-{[3-(4-morpholinyl)propyl]amino}-3-{(Z)-[4-oxo-3-(tetrahydro-2-furanylmethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-A]pyrimidin-4-one
    —— 2-(2,6-dimethylmorpholin-4-yl)-3-{(Z)-[3-(3-methoxypropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C22H26N4O4S2
    2-(2,6-dimethylmorpholin-4-yl)-3-{(Z)-[3-(3-methoxypropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (2E)-2-cyano-N-(1,1-dioxidotetrahydrothiophen-3-yl)-3-[4-oxo-2-(piperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide —— C21H23N5O4S
    (2E)-2-cyano-N-(1,1-dioxidotetrahydrothiophen-3-yl)-3-[4-oxo-2-(piperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide
    —— 1-(3-{(1E)-2-cyano-3-oxo-3-[(2-phenylethyl)amino]prop-1-en-1-yl}-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxamide —— C27H28N6O3
    1-(3-{(1E)-2-cyano-3-oxo-3-[(2-phenylethyl)amino]prop-1-en-1-yl}-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxamide
    —— 2-(dipropylamino)-3-{(Z)-[3-(4-methoxybenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C26H28N4O3S2
    2-(dipropylamino)-3-{(Z)-[3-(4-methoxybenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-[(Z)-(3-cyclohexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-{[2-(2-hydroxyethoxy)ethyl]amino}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H28N4O4S2
    3-[(Z)-(3-cyclohexyl-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene)methyl]-2-{[2-(2-hydroxyethoxy)ethyl]amino}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[2-(2-hydroxyethoxy)ethyl]amino}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H23ClN4O4S2
    3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-{[2-(2-hydroxyethoxy)ethyl]amino}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-(3,5-dimethylpiperidin-1-yl)-3-{(Z)-[4-oxo-3-(2-phenylethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C27H28N4O2S2
    2-(3,5-dimethylpiperidin-1-yl)-3-{(Z)-[4-oxo-3-(2-phenylethyl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-(3,5-dimethylpiperidin-1-yl)-7-methyl-3-{(Z)-[4-oxo-3-(propan-2-yl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H28N4O2S2
    2-(3,5-dimethylpiperidin-1-yl)-7-methyl-3-{(Z)-[4-oxo-3-(propan-2-yl)-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one