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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
    —— 3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(2-phenylethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H24N4O3S2
    3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(2-phenylethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-(dipropylamino)-3-{(Z)-[3-(2-methylpropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C22H28N4O2S2
    2-(dipropylamino)-3-{(Z)-[3-(2-methylpropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-(propylamino)-4H-pyrido[1,2-a]pyrimidin-4-one —— C19H22N4O3S2
    3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-(propylamino)-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(tetrahydrofuran-2-ylmethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one —— C21H24N4O4S2
    3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(tetrahydrofuran-2-ylmethyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-[4-[2-(4-fluorophenyl)ethyl]-1,3-dihydroimidazol-2-ylidene]-7-morpholin-4-ylpyrido[1,2-a]pyrimidine-3,4-dione —— C23H22FN5O3
    2-[4-[2-(4-fluorophenyl)ethyl]-1,3-dihydroimidazol-2-ylidene]-7-morpholin-4-ylpyrido[1,2-a]pyrimidine-3,4-dione
    —— N,9-bis(2-phenylethyl)-2,3,5,7,9-pentazatricyclo[6.3.1.04,12]dodeca-4(12),5,7-trien-6-amine —— C23H26N6
    N,9-bis(2-phenylethyl)-2,3,5,7,9-pentazatricyclo[6.3.1.04,12]dodeca-4(12),5,7-trien-6-amine
    —— 4-[1-[[6-[2-(1,3-Thiazol-5-yl)ethynyl]-4-(2,2,2-trifluoroethylamino)pyrido[3,2-d]pyrimidin-2-yl]amino]ethyl]benzenesulfinic acid —— C22H17F3N6O2S2
    4-[1-[[6-[2-(1,3-Thiazol-5-yl)ethynyl]-4-(2,2,2-trifluoroethylamino)pyrido[3,2-d]pyrimidin-2-yl]amino]ethyl]benzenesulfinic acid
    —— (5E)-5-[[2-(cyclohexylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H36N4O2S2
    (5E)-5-[[2-(cyclohexylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-(3-ethoxypropylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H36N4O3S2
    (5E)-5-[[2-(3-ethoxypropylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— [(5Z)-5-{[7-methyl-4-oxo-2-(pentylamino)-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-4-oxo-2-thioxo-1,3-thiazolidin-3-yl]acetic acid —— C20H22N4O4S2
    [(5Z)-5-{[7-methyl-4-oxo-2-(pentylamino)-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-4-oxo-2-thioxo-1,3-thiazolidin-3-yl]acetic acid
    —— (5E)-5-[[7-methyl-4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C29H34N4O2S2
    (5E)-5-[[7-methyl-4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[9-methyl-2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C28H38N4O2S2
    (5E)-5-[[9-methyl-2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-(cyclohexylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H36N4O2S2
    (5E)-5-[[2-(cyclohexylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 4-cyclopropyl-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one —— C11H11N3OS
    4-cyclopropyl-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one
    —— (5E)-5-[[2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C27H36N4O2S2
    (5E)-5-[[2-[(4-methylcyclohexyl)amino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— [(5Z)-5-{[9-methyl-4-oxo-2-(pentylamino)-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-4-oxo-2-thioxo-1,3-thiazolidin-3-yl]acetic acid —— C20H22N4O4S2
    [(5Z)-5-{[9-methyl-4-oxo-2-(pentylamino)-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-4-oxo-2-thioxo-1,3-thiazolidin-3-yl]acetic acid
    —— (5E)-3-octyl-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C28H32N4O2S2
    (5E)-3-octyl-5-[[4-oxo-2-(2-phenylethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-{[7-Methyl-4-oxo-2-(propylamino)-4H-pyrido[1,2-A]pyrimidin-3-YL]methylidene}-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H32N4O2S2
    (5E)-5-{[7-Methyl-4-oxo-2-(propylamino)-4H-pyrido[1,2-A]pyrimidin-3-YL]methylidene}-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[9-methyl-4-oxo-2-(pentylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H36N4O2S2
    (5E)-5-[[9-methyl-4-oxo-2-(pentylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-({2-[(2-Hydroxyethyl)amino]-7-methyl-4-oxo-4H-pyrido[1,2-A]pyrimidin-3-YL}methylidene)-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C23H30N4O3S2
    (5E)-5-({2-[(2-Hydroxyethyl)amino]-7-methyl-4-oxo-4H-pyrido[1,2-A]pyrimidin-3-YL}methylidene)-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-Hydroxy-4-oxo-7-[(2,2,2-trifluoroacetyl)amino]pyrido[1,2-a]pyrimidine-2-carboxylic acid —— C11H6F3N3O5
    3-Hydroxy-4-oxo-7-[(2,2,2-trifluoroacetyl)amino]pyrido[1,2-a]pyrimidine-2-carboxylic acid
    —— 5-{(Z)-1-[2-(isobutylamino)-7-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-3-(1-phenylethyl)-2-thioxo-1,3-thiazolan-4-one —— C25H26N4O2S2
    5-{(Z)-1-[2-(isobutylamino)-7-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]methylidene}-3-(1-phenylethyl)-2-thioxo-1,3-thiazolan-4-one
    —— (5E)-5-{[9-Methyl-4-oxo-2-(piperidin-1-YL)-4H-pyrido[1,2-A]pyrimidin-3-YL]methylidene}-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H34N4O2S2
    (5E)-5-{[9-Methyl-4-oxo-2-(piperidin-1-YL)-4H-pyrido[1,2-A]pyrimidin-3-YL]methylidene}-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-(furan-2-ylmethylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C26H30N4O3S2
    (5E)-5-[[2-(furan-2-ylmethylamino)-9-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[(7-methyl-2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H32N4O3S2
    (5E)-5-[(7-methyl-2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-({7-Methyl-4-oxo-2-[(prop-2-EN-1-YL)amino]-4H-pyrido[1,2-A]pyrimidin-3-YL}methylidene)-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H30N4O2S2
    (5E)-5-({7-Methyl-4-oxo-2-[(prop-2-EN-1-YL)amino]-4H-pyrido[1,2-A]pyrimidin-3-YL}methylidene)-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-3-octyl-5-[[4-oxo-2-(oxolan-2-ylmethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H32N4O3S2
    (5E)-3-octyl-5-[[4-oxo-2-(oxolan-2-ylmethylamino)pyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-[2-(2-hydroxyethoxy)ethylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C24H32N4O4S2
    (5E)-5-[[2-[2-(2-hydroxyethoxy)ethylamino]-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-[2-(2-hydroxyethoxy)ethylamino]-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H34N4O4S2
    (5E)-5-[[2-[2-(2-hydroxyethoxy)ethylamino]-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— (5E)-5-[[2-(ethylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C22H28N4O2S2
    (5E)-5-[[2-(ethylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 2-(3,4-dihydroisoquinolin-2(1H)-yl)-3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one —— C28H21FN4O2S2
    2-(3,4-dihydroisoquinolin-2(1H)-yl)-3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (5E)-5-[[2-(3-ethoxypropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H34N4O3S2
    (5E)-5-[[2-(3-ethoxypropylamino)-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 2-Methyl-8-pentan-2-ylpyrido[2,3-d]pyrimidin-7-one —— C13H17N3O
    2-Methyl-8-pentan-2-ylpyrido[2,3-d]pyrimidin-7-one
    —— (5E)-5-[(9-methyl-2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one —— C25H32N4O3S2
    (5E)-5-[(9-methyl-2-morpholin-4-yl-4-oxopyrido[1,2-a]pyrimidin-3-yl)methylidene]-3-octyl-2-sulfanylidene-1,3-thiazolidin-4-one
    —— Tert-butyl 3-[8-[(4-tert-butyl-1,3-thiazol-2-yl)carbamoyl]-2-(3,4-dihydroxypiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enoate —— C28H35N5O6S
    Tert-butyl 3-[8-[(4-tert-butyl-1,3-thiazol-2-yl)carbamoyl]-2-(3,4-dihydroxypiperidin-1-yl)-4-oxopyrido[1,2-a]pyrimidin-3-yl]prop-2-enoate
    —— 2-(dipropylamino)-3-{(Z)-[3-(3-ethoxypropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H32N4O3S2
    2-(dipropylamino)-3-{(Z)-[3-(3-ethoxypropyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-(2,6-dimethylmorpholin-4-yl)-3-[(Z)-{3-[2-(4-methoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C28H30N4O4S2
    2-(2,6-dimethylmorpholin-4-yl)-3-[(Z)-{3-[2-(4-methoxyphenyl)ethyl]-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene}methyl]-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 2-Chloro-8-(1-methylimidazol-4-yl)pyrido[3,4-d]pyrimidin-4-amine —— C11H9ClN6
    2-Chloro-8-(1-methylimidazol-4-yl)pyrido[3,4-d]pyrimidin-4-amine
    —— (3Z)-2-(4-chlorophenyl)imino-9-methyl-3-[(2-phenylhydrazinyl)methylidene]pyrido[1,2-a]pyrimidin-4-one —— C22H18ClN5O
    (3Z)-2-(4-chlorophenyl)imino-9-methyl-3-[(2-phenylhydrazinyl)methylidene]pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-9-methyl-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H21FN4O2S2
    3-{(Z)-[3-(4-fluorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-9-methyl-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(butan-2-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-[(4-methylbenzyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H24N4O2S2
    3-{(Z)-[3-(butan-2-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-[(4-methylbenzyl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H19ClN4O2S2
    3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-9-methyl-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H21ClN4O2S2
    3-{(Z)-[3-(2-chlorobenzyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-9-methyl-2-(pyrrolidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (2E)-N-benzyl-2-cyano-3-[2-(2,6-dimethylmorpholin-4-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide —— C26H27N5O3
    (2E)-N-benzyl-2-cyano-3-[2-(2,6-dimethylmorpholin-4-yl)-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl]prop-2-enamide
    —— 3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one —— C25H33N5O3S2
    3-{(Z)-[3-(2-methoxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-[(2,2,6,6-tetramethylpiperidin-4-yl)amino]-4H-pyrido[1,2-a]pyrimidin-4-one
    —— 5-amino-3,7-dimethyl-2,4-dioxo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic acid —— C10H10N4O4
    5-amino-3,7-dimethyl-2,4-dioxo-1H-pyrido[2,3-d]pyrimidine-6-carboxylic acid
    —— 4-{(5Z)-4-oxo-5-[(4-oxo-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-3-yl)methylidene]-2-thioxo-1,3-thiazolidin-3-yl}butanoic acid —— C22H26N4O5S2
    4-{(5Z)-4-oxo-5-[(4-oxo-2-{[3-(propan-2-yloxy)propyl]amino}-4H-pyrido[1,2-a]pyrimidin-3-yl)methylidene]-2-thioxo-1,3-thiazolidin-3-yl}butanoic acid
    —— 3-{(Z)-[3-(1,1-dioxidotetrahydrothiophen-3-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-(2-ethylpiperidin-1-yl)-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one —— C24H28N4O4S3
    3-{(Z)-[3-(1,1-dioxidotetrahydrothiophen-3-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-2-(2-ethylpiperidin-1-yl)-9-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
    —— (5Z)-3-butyl-5-[[2-(furan-2-ylmethylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one —— C22H22N4O3S2
    (5Z)-3-butyl-5-[[2-(furan-2-ylmethylamino)-7-methyl-4-oxopyrido[1,2-a]pyrimidin-3-yl]methylidene]-2-sulfanylidene-1,3-thiazolidin-4-one
    —— 3-{(Z)-[3-(butan-2-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-(4-methylpiperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one —— C23H28N4O2S2
    3-{(Z)-[3-(butan-2-yl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}-7-methyl-2-(4-methylpiperidin-1-yl)-4H-pyrido[1,2-a]pyrimidin-4-one