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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 吡喃吡啶类

    吡喃吡啶类

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 5-ethyl-2,2-dimethyl-N-(tetrahydrofuran-2-ylmethyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C21H26N4O2S
    5-ethyl-2,2-dimethyl-N-(tetrahydrofuran-2-ylmethyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 2-amino-4-(3,4-diethoxyphenyl)-7-methyl-5-oxo-6-(pyridin-3-ylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C26H26N4O4
    2-amino-4-(3,4-diethoxyphenyl)-7-methyl-5-oxo-6-(pyridin-3-ylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2,2,5-trimethyl-N-(4-phenylbutan-2-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C25H28N4OS
    2,2,5-trimethyl-N-(4-phenylbutan-2-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 2-{[2,2-dimethyl-5-(pyrrolidin-1-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-1-(piperidin-1-yl)ethanone —— C25H31N5O2S2
    2-{[2,2-dimethyl-5-(pyrrolidin-1-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-1-(piperidin-1-yl)ethanone
    —— 2-(7,7-Dimethyl-4-oxo-3-phenyl-3,5,7,8-tetrahydro-4H-6-oxa-1,3,9-triaza-anthracen-2-ylsulfanyl)-N-(1-m ethyl-2-phenyl-ethyl)-acetamide —— C29H30N4O3S
    2-(7,7-Dimethyl-4-oxo-3-phenyl-3,5,7,8-tetrahydro-4H-6-oxa-1,3,9-triaza-anthracen-2-ylsulfanyl)-N-(1-m ethyl-2-phenyl-ethyl)-acetamide
    —— 2-[(8-ethyl-8-methyl-4-oxo-3-phenyl-3,6,8,9-tetrahydro-4H-pyrano[3',4':5,6]pyrido[2,3-d]pyrimidin-2-yl)sulfanyl]-N-(4-methylphenyl)acetamide —— C28H28N4O3S
    2-[(8-ethyl-8-methyl-4-oxo-3-phenyl-3,6,8,9-tetrahydro-4H-pyrano[3',4':5,6]pyrido[2,3-d]pyrimidin-2-yl)sulfanyl]-N-(4-methylphenyl)acetamide
    —— 2-(8,8-dimethyl-4-oxo-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(4-methoxyphenyl)propanamide —— C24H24N4O4S
    2-(8,8-dimethyl-4-oxo-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(4-methoxyphenyl)propanamide
    —— 2-(8,8-dimethyl-4-oxo-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(naphthalen-1-yl)acetamide —— C26H22N4O3S
    2-(8,8-dimethyl-4-oxo-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(naphthalen-1-yl)acetamide
    —— 2-(8,8-dimethyl-4-oxo-2-propyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(2-methylphenyl)acetamide —— C26H28N4O3S
    2-(8,8-dimethyl-4-oxo-2-propyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-3(4H)-yl)-N-(2-methylphenyl)acetamide
    —— 3,3,8-trimethyl-6-(pentylamino)-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile —— C17H25N3O
    3,3,8-trimethyl-6-(pentylamino)-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile
    —— N-(5-Isopropyl-2,2-dimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL)-N-phenethylamine —— C25H28N4OS
    N-(5-Isopropyl-2,2-dimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL)-N-phenethylamine
    —— 2,2-dimethyl-8-(methylsulfanyl)-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d][1,2,3]triazine —— C18H21N5O2S2
    2,2-dimethyl-8-(methylsulfanyl)-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d][1,2,3]triazine
    —— 2,2-dimethyl-5-(2-methylpropyl)-N-(tetrahydrofuran-2-ylmethyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C23H30N4O2S
    2,2-dimethyl-5-(2-methylpropyl)-N-(tetrahydrofuran-2-ylmethyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 2-amino-6-(1,3-benzodioxol-5-ylmethyl)-4-(2-chlorophenyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C24H18ClN3O4
    2-amino-6-(1,3-benzodioxol-5-ylmethyl)-4-(2-chlorophenyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-amino-4-(2,6-dichlorophenyl)-6-[3-(diethylamino)propyl]-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C23H26Cl2N4O2
    2-amino-4-(2,6-dichlorophenyl)-6-[3-(diethylamino)propyl]-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-amino-4-(2,3-dichlorophenyl)-6-(furan-2-ylmethyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C21H15Cl2N3O3
    2-amino-4-(2,3-dichlorophenyl)-6-(furan-2-ylmethyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-amino-4-(2-fluorophenyl)-7-methyl-5-oxo-6-(2-phenylethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C24H20FN3O2
    2-amino-4-(2-fluorophenyl)-7-methyl-5-oxo-6-(2-phenylethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-[(2,2-dimethyl-5-propyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl)sulfanyl]-N-(4-phenylbutan-2-yl)acetamide —— C29H34N4O2S2
    2-[(2,2-dimethyl-5-propyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl)sulfanyl]-N-(4-phenylbutan-2-yl)acetamide
    —— 12,12-Dimethyl-5-sulfanylidene-13-oxa-2,4,6-triazatricyclo[8.4.0.03,8]tetradeca-1,3(8),9-trien-7-one —— C12H13N3O2S
    12,12-Dimethyl-5-sulfanylidene-13-oxa-2,4,6-triazatricyclo[8.4.0.03,8]tetradeca-1,3(8),9-trien-7-one
    —— 3-{[2,2-dimethyl-10-(methylsulfanyl)-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]amino}propan-1-ol —— C22H29N5O3S2
    3-{[2,2-dimethyl-10-(methylsulfanyl)-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]amino}propan-1-ol
    —— 2,2-Dimethyl-5-morpholin-4-yl-8-propoxy-1,4-dihydro-2H-3-oxa-7-thia-6,9,10,11-tetraaza-benzo[c]fluor ene —— C20H25N5O3S
    2,2-Dimethyl-5-morpholin-4-yl-8-propoxy-1,4-dihydro-2H-3-oxa-7-thia-6,9,10,11-tetraaza-benzo[c]fluor ene
    —— 2,2-dimethyl-8-{[4-(propan-2-yloxy)benzyl]sulfanyl}-5-propyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine —— C27H31N3O2S2
    2,2-dimethyl-8-{[4-(propan-2-yloxy)benzyl]sulfanyl}-5-propyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine
    —— 6-(dibutylamino)-8-ethyl-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile —— C21H33N3O
    6-(dibutylamino)-8-ethyl-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile
    —— 8-[(3,4-dichlorobenzyl)sulfanyl]-2,2-dimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine —— C25H24Cl2N4O2S2
    8-[(3,4-dichlorobenzyl)sulfanyl]-2,2-dimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine
    —— 4-Fluorobenzyl (2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL) sulfide —— C22H20FN3OS2
    4-Fluorobenzyl (2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL) sulfide
    —— ethyl {[5-cyano-8-(morpholin-4-yl)-3-(propan-2-yl)-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl]sulfanyl}acetate —— C20H27N3O4S
    ethyl {[5-cyano-8-(morpholin-4-yl)-3-(propan-2-yl)-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl]sulfanyl}acetate
    —— 2-amino-6-(3,4-dimethoxyphenethyl)-7-methyl-4-(2-nitrophenyl)-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C26H24N4O6
    2-amino-6-(3,4-dimethoxyphenethyl)-7-methyl-4-(2-nitrophenyl)-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-{[5-(furan-2-yl)-2,2-dimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-N-(1-phenylpropan-2-yl)acetamide —— C29H28N4O3S2
    2-{[5-(furan-2-yl)-2,2-dimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-N-(1-phenylpropan-2-yl)acetamide
    —— 2-methylpropyl {[5-cyano-3,3-dimethyl-8-(morpholin-4-yl)-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl]sulfanyl}acetate —— C21H29N3O4S
    2-methylpropyl {[5-cyano-3,3-dimethyl-8-(morpholin-4-yl)-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl]sulfanyl}acetate
    —— 2-amino-6-(benzo[d][1,3]dioxol-5-ylmethyl)-7-methyl-5-oxo-4-phenyl-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C24H19N3O4
    2-amino-6-(benzo[d][1,3]dioxol-5-ylmethyl)-7-methyl-5-oxo-4-phenyl-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 8,8-dimethyl-3-(2-methylpropyl)-2-propyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-4(3H)-one —— C21H27N3O2S
    8,8-dimethyl-3-(2-methylpropyl)-2-propyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-4(3H)-one
    —— 9-benzyl-2,2,10-trimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8(9H)-one —— C26H28N4O3S
    9-benzyl-2,2,10-trimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8(9H)-one
    —— N-hexyl-2,2-dimethyl-5-(pyrrolidin-1-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C24H33N5OS
    N-hexyl-2,2-dimethyl-5-(pyrrolidin-1-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 2-amino-6-(2-(dimethylamino)ethyl)-7-methyl-5-oxo-4-(2,4,5-trimethoxyphenyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C23H28N4O5
    2-amino-6-(2-(dimethylamino)ethyl)-7-methyl-5-oxo-4-(2,4,5-trimethoxyphenyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— 2-amino-4-(3,4-diethoxyphenyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C20H21N3O4
    2-amino-4-(3,4-diethoxyphenyl)-7-methyl-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— ethyl 3-{[2,2-dimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-2-oxopropanoate —— C23H26N4O5S2
    ethyl 3-{[2,2-dimethyl-5-(morpholin-4-yl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-yl]sulfanyl}-2-oxopropanoate
    —— 2,2-dimethyl-5-(morpholin-4-yl)-8-(pentyloxy)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine —— C23H30N4O3S
    2,2-dimethyl-5-(morpholin-4-yl)-8-(pentyloxy)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine
    —— 2-amino-4-(2-fluorophenyl)-7-methyl-6-(2-morpholinoethyl)-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C22H23FN4O3
    2-amino-4-(2-fluorophenyl)-7-methyl-6-(2-morpholinoethyl)-5-oxo-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— N,N-dibutyl-2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C23H32N4OS
    N,N-dibutyl-2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 4,4-Dimethyl-8-(2-methylpropyl)-13-(3-phenylprop-2-enylsulfanyl)-5-oxa-11-thia-9,14,16-triazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2(7),8,12(17),13,15-hexaene —— C27H29N3OS2
    4,4-Dimethyl-8-(2-methylpropyl)-13-(3-phenylprop-2-enylsulfanyl)-5-oxa-11-thia-9,14,16-triazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2(7),8,12(17),13,15-hexaene
    —— 2-amino-4-(2,6-dichlorophenyl)-7-methyl-5-oxo-6-(2-phenylethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C24H19Cl2N3O2
    2-amino-4-(2,6-dichlorophenyl)-7-methyl-5-oxo-6-(2-phenylethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile
    —— (2,2-Dimethyl-5-morpholin-4-yl-1,4-dihydro-2H-3-oxa-7-thia-6,9,10,11-tetraaza-benzo[c]fluoren-8-yl)-di ethyl-amine —— C21H28N6O2S
    (2,2-Dimethyl-5-morpholin-4-yl-1,4-dihydro-2H-3-oxa-7-thia-6,9,10,11-tetraaza-benzo[c]fluoren-8-yl)-di ethyl-amine
    —— 2,2-dimethyl-N-(3-methylbutyl)-5-(2-methylpropyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C23H32N4OS
    2,2-dimethyl-N-(3-methylbutyl)-5-(2-methylpropyl)-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 2,2-dimethyl-10-(methylsulfanyl)-5-(morpholin-4-yl)-N-pentyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine —— C24H33N5O2S2
    2,2-dimethyl-10-(methylsulfanyl)-5-(morpholin-4-yl)-N-pentyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-d]pyrimidin-8-amine
    —— 3,3-dimethyl-8-(morpholin-4-yl)-6-(propylsulfanyl)-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile —— C18H25N3O2S
    3,3-dimethyl-8-(morpholin-4-yl)-6-(propylsulfanyl)-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile
    —— 4-(hexadecylsulfanyl)-8,8-dimethyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine —— C30H45N3OS2
    4-(hexadecylsulfanyl)-8,8-dimethyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-d]pyrimidine
    —— N-Butyl-N,4,4-trimethyl-8-morpholin-4-yl-5-oxa-11-thia-9,14,16-triazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2(7),8,12(17),13,15-hexaen-13-amine —— C23H31N5O2S
    N-Butyl-N,4,4-trimethyl-8-morpholin-4-yl-5-oxa-11-thia-9,14,16-triazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2(7),8,12(17),13,15-hexaen-13-amine
    —— N-Butyl-N-methyl-N-(2,8,8-trimethyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-4-YL)amine —— C20H26N4OS
    N-Butyl-N-methyl-N-(2,8,8-trimethyl-7,10-dihydro-8H-pyrano[3'',4'':5',6']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-4-YL)amine
    —— N,N-Dibenzyl-N-(2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL)amine —— C29H28N4OS
    N,N-Dibenzyl-N-(2,2,5-trimethyl-1,4-dihydro-2H-pyrano[4'',3'':4',5']pyrido[3',2':4,5]thieno[3,2-D]pyrimidin-8-YL)amine
    —— 2-amino-4-(4-fluorophenyl)-7-methyl-5-oxo-6-(pyridin-2-ylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile —— C22H17FN4O2
    2-amino-4-(4-fluorophenyl)-7-methyl-5-oxo-6-(pyridin-2-ylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile