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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
    —— (3R)-1-(4-oxopyrido[1,2-a]pyrimidine-3-carbonyl)-N-[(2S)-pentan-2-yl]piperidine-3-carboxamide —— C20H26N4O3
    (3R)-1-(4-oxopyrido[1,2-a]pyrimidine-3-carbonyl)-N-[(2S)-pentan-2-yl]piperidine-3-carboxamide
    —— (3S)-1-(4-oxopyrido[1,2-a]pyrimidine-3-carbonyl)-N-[(2R)-pentan-2-yl]piperidine-3-carboxamide —— C20H26N4O3
    (3S)-1-(4-oxopyrido[1,2-a]pyrimidine-3-carbonyl)-N-[(2R)-pentan-2-yl]piperidine-3-carboxamide
    —— 3-{[2-(3,4-dimethoxyphenyl)ethyl]carbamoyl}-1-ethyl-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidin-2-iminium —— C24H26N5O4+
    3-{[2-(3,4-dimethoxyphenyl)ethyl]carbamoyl}-1-ethyl-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidin-2-iminium
    —— (3R)-1-(2,4-dioxo-1H-pyrido[2,3-d]pyrimidine-6-carbonyl)-N-propylpiperidine-3-carboxamide —— C17H21N5O4
    (3R)-1-(2,4-dioxo-1H-pyrido[2,3-d]pyrimidine-6-carbonyl)-N-propylpiperidine-3-carboxamide
    —— 5-[(9-Methyl-4-oxo-2-pyrrolidin-1-ylpyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-(2-methylpropyl)-2-sulfanylidene-1,3-thiazolidin-4-one —— C21H24N4O2S2
    5-[(9-Methyl-4-oxo-2-pyrrolidin-1-ylpyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-(2-methylpropyl)-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-[(2-Chlorophenyl)methyl]-5-[[2-(dipropylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H27ClN4O2S2
    3-[(2-Chlorophenyl)methyl]-5-[[2-(dipropylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 5-[[2-(Dipropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-(1-phenylethyl)-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H28N4O2S2
    5-[[2-(Dipropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-(1-phenylethyl)-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 2-cyano-N-cyclohexyl-3-[2-(2,6-dimethylmorpholin-4-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide —— C24H29N5O3
    2-cyano-N-cyclohexyl-3-[2-(2,6-dimethylmorpholin-4-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide
    —— 3-(2-Methoxyethyl)-5-[[7-methyl-2-(4-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C22H26N4O3S2
    3-(2-Methoxyethyl)-5-[[7-methyl-2-(4-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 4-[5-[[9-methyl-4-oxo-2-(2-phenylethylamino)-5H-pyrido[1,2-a]pyrimidin-5-ium-3-yl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]butanoate —— C25H24N4O4S2
    4-[5-[[9-methyl-4-oxo-2-(2-phenylethylamino)-5H-pyrido[1,2-a]pyrimidin-5-ium-3-yl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]butanoate
    —— Ethyl 7-butyl-6-(2,4-dichlorobenzoyl)imino-2-oxo-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate —— C25H22Cl2N4O4
    Ethyl 7-butyl-6-(2,4-dichlorobenzoyl)imino-2-oxo-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate
    —— N-[(4-fluorophenyl)methyl]-2-[3-oxo-5-[(4-oxopyrido[1,2-a]pyrimidin-2-yl)methylsulfanyl]-2H-imidazo[1,2-c]quinazolin-2-yl]acetamide —— C28H21FN6O3S
    N-[(4-fluorophenyl)methyl]-2-[3-oxo-5-[(4-oxopyrido[1,2-a]pyrimidin-2-yl)methylsulfanyl]-2H-imidazo[1,2-c]quinazolin-2-yl]acetamide
    —— (Z)-2-(1H-benzimidazol-2-yl)-3-[2-(dibenzylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enenitrile —— C32H24N6O
    (Z)-2-(1H-benzimidazol-2-yl)-3-[2-(dibenzylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enenitrile
    —— 6-(2-Hydroxypropyl)-2-[(2-methylphenyl)methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one —— C18H23N3O2
    6-(2-Hydroxypropyl)-2-[(2-methylphenyl)methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one
    —— propan-2-yl 5-(4-ethoxyphenyl)-2-ethylsulfanyl-7-methyl-4-oxo-5,8-dihydro-3H-pyrido[2,3-d]pyrimidine-6-carboxylate —— C22H27N3O4S
    propan-2-yl 5-(4-ethoxyphenyl)-2-ethylsulfanyl-7-methyl-4-oxo-5,8-dihydro-3H-pyrido[2,3-d]pyrimidine-6-carboxylate
    —— 5-[(7-Methyl-4-oxo-2-piperidin-1-ylpyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-[(4-methylphenyl)methyl]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H26N4O2S2
    5-[(7-Methyl-4-oxo-2-piperidin-1-ylpyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-[(4-methylphenyl)methyl]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 6-Ethylsulfonyl-2-[(4-methylphenyl)methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one —— C17H21N3O3S
    6-Ethylsulfonyl-2-[(4-methylphenyl)methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one
    —— 3-(2-Methoxyethyl)-5-[[2-(2-methylpropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C19H22N4O3S2
    3-(2-Methoxyethyl)-5-[[2-(2-methylpropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— Ethyl 7-benzyl-6-[3-(2,4-dichlorophenoxy)propanoylimino]-2-oxo-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate —— C30H24Cl2N4O5
    Ethyl 7-benzyl-6-[3-(2,4-dichlorophenoxy)propanoylimino]-2-oxo-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaene-5-carboxylate
    —— 5-[[2-(2,6-Dimethylmorpholin-4-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-(furan-2-ylmethyl)-2-sulfanylidene-1,3-thiazolidin-4-one —— C23H22N4O4S2
    5-[[2-(2,6-Dimethylmorpholin-4-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-(furan-2-ylmethyl)-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 7-(3-Ethoxypropyl)-5-(4-ethylpiperazine-1-carbonyl)-6-imino-11-methyl-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaen-2-one —— C24H32N6O3
    7-(3-Ethoxypropyl)-5-(4-ethylpiperazine-1-carbonyl)-6-imino-11-methyl-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaen-2-one
    —— 6-[5-[[9-Methyl-2-(3-morpholin-4-ylpropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]hexanoic acid —— C26H33N5O5S2
    6-[5-[[9-Methyl-2-(3-morpholin-4-ylpropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]hexanoic acid
    —— 3-Cyclohexyl-5-[[2-(2-hydroxyethylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C21H24N4O3S2
    3-Cyclohexyl-5-[[2-(2-hydroxyethylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 2-imino-N~3~-isopropyl-1-(4-methoxyphenethyl)-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2,3-d]pyrimidine-3-carboxamide —— C24H25N5O3
    2-imino-N~3~-isopropyl-1-(4-methoxyphenethyl)-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2,3-d]pyrimidine-3-carboxamide
    —— 5-[[2-(2-Hydroxyethylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C22H28N4O3S2
    5-[[2-(2-Hydroxyethylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 6-Imino-5-(4-methylpiperazine-1-carbonyl)-7-(1-phenylethyl)-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaen-2-one —— C25H26N6O2
    6-Imino-5-(4-methylpiperazine-1-carbonyl)-7-(1-phenylethyl)-1,7,9-triazatricyclo[8.4.0.03,8]tetradeca-3(8),4,9,11,13-pentaen-2-one
    —— N-(3-bromophenyl)-4-oxo-2-[[2-(trifluoromethyl)phenyl]methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidine-6-carboxamide —— C22H18BrF3N4O2
    N-(3-bromophenyl)-4-oxo-2-[[2-(trifluoromethyl)phenyl]methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidine-6-carboxamide
    —— Ethyl 1-[3-[(3-methyl-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]-4-oxopyrido[1,2-a]pyrimidin-2-yl]piperidine-4-carboxylate —— C21H22N4O4S2
    Ethyl 1-[3-[(3-methyl-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]-4-oxopyrido[1,2-a]pyrimidin-2-yl]piperidine-4-carboxylate
    —— 2-cyano-N-cyclohexyl-3-(2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)prop-2-enamide —— C22H25N5O3
    2-cyano-N-cyclohexyl-3-(2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)prop-2-enamide
    —— 3-Butyl-5-[[9-methyl-4-oxo-2-(3-propan-2-yloxypropylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C23H30N4O3S2
    3-Butyl-5-[[9-methyl-4-oxo-2-(3-propan-2-yloxypropylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-Ethyl-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C22H20N4O2S2
    3-Ethyl-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 2-(3-Fluorophenyl)-6-propanoyl-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one —— C16H16FN3O2
    2-(3-Fluorophenyl)-6-propanoyl-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one
    —— 5-[[7-Methyl-2-[(4-methylphenyl)methylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-prop-2-enyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H22N4O2S2
    5-[[7-Methyl-2-[(4-methylphenyl)methylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-prop-2-enyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— N-[(2E)-3-cyano-5-oxo-1-pentyl-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidin-2-ylidene]-2-fluorobenzamide —— C24H20FN5O2
    N-[(2E)-3-cyano-5-oxo-1-pentyl-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidin-2-ylidene]-2-fluorobenzamide
    —— 1-[2-(3,4-dimethoxyphenyl)ethyl]-2-imino-10-methyl-N-[2-(morpholin-4-yl)ethyl]-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxamide —— C29H34N6O5
    1-[2-(3,4-dimethoxyphenyl)ethyl]-2-imino-10-methyl-N-[2-(morpholin-4-yl)ethyl]-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxamide
    —— 5-(2H-1,3-Benzodioxol-5-YL)-2-{[(2-fluorophenyl)methyl]sulfanyl}-8,8-dimethyl-3H,4H,5H,6H,7H,8H,9H,10H-pyrimido[4,5-B]quinoline-4,6-dione —— C27H24FN3O4S
    5-(2H-1,3-Benzodioxol-5-YL)-2-{[(2-fluorophenyl)methyl]sulfanyl}-8,8-dimethyl-3H,4H,5H,6H,7H,8H,9H,10H-pyrimido[4,5-B]quinoline-4,6-dione
    —— 5-[[9-Methyl-2-[(4-methylphenyl)methylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-propyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H24N4O2S2
    5-[[9-Methyl-2-[(4-methylphenyl)methylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-propyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-4-oxo-2-(propylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H22N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-4-oxo-2-(propylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(3,5-dimethylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H26N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(3,5-dimethylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-4-oxo-2-(oxolan-2-ylmethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H24N4O5S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-4-oxo-2-(oxolan-2-ylmethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(furan-2-ylmethylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H20N4O5S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(furan-2-ylmethylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[9-methyl-2-(3-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H26N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[9-methyl-2-(3-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H24N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H24N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H22N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(cyclopentylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(3,5-dimethylpiperidin-1-yl)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C28H28N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[2-(3,5-dimethylpiperidin-1-yl)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-2-(3-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H26N4O4S2
    3-(1,3-Benzodioxol-5-ylmethyl)-5-[[7-methyl-2-(3-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,1-Dioxothiolan-3-yl)-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H22N4O4S3
    3-(1,1-Dioxothiolan-3-yl)-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,1-Dioxothiolan-3-yl)-5-[[2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C23H26N4O4S3
    3-(1,1-Dioxothiolan-3-yl)-5-[[2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-(1,1-Dioxothiolan-3-yl)-5-[[9-methyl-2-(2-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C23H26N4O4S3
    3-(1,1-Dioxothiolan-3-yl)-5-[[9-methyl-2-(2-methylpiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one