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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 苯并吡喃

    苯并吡喃

    相关化合物

    中文名称 英文名称 CAS号 化学式 结构式图片
    —— dodecyl N-[4-(ethylcarbamoyloxy)-15,16-bis(4-hydroxybutyl)-12-(oxan-2-yloxyimino)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate —— C51H81N3O10
    dodecyl N-[4-(ethylcarbamoyloxy)-15,16-bis(4-hydroxybutyl)-12-(oxan-2-yloxyimino)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate
    —— [15,16-bis(4-hydroxybutyl)-10-[[2-(3-methoxyphenyl)acetyl]-methylamino]-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-(2,4-dimethoxyphenyl)carbamate —— C50H65N3O11
    [15,16-bis(4-hydroxybutyl)-10-[[2-(3-methoxyphenyl)acetyl]-methylamino]-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-(2,4-dimethoxyphenyl)carbamate
    —— 7-chloro-1-(3-chlorophenyl)-2-pyrimidin-2-yl-1H-chromeno[2,3-c]pyrrole-3,9-dione —— C21H11Cl2N3O3
    7-chloro-1-(3-chlorophenyl)-2-pyrimidin-2-yl-1H-chromeno[2,3-c]pyrrole-3,9-dione
    —— 4-[4-(3,4-Dimethylphenoxy)-16-(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-10-naphthalen-2-ylsulfanyl-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-15-yl]butan-1-ol —— C49H59NO6S
    4-[4-(3,4-Dimethylphenoxy)-16-(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-10-naphthalen-2-ylsulfanyl-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-15-yl]butan-1-ol
    —— N-[4-hydroxy-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methyl-3-(4-nitrophenyl)prop-2-enamide —— C41H53N3O9
    N-[4-hydroxy-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methyl-3-(4-nitrophenyl)prop-2-enamide
    —— 2,2-dimethylpropyl N-[4-(3-formyl-4-methoxyphenoxy)-15,16-bis(4-hydroxybutyl)-12-methoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate —— C45H62N2O10
    2,2-dimethylpropyl N-[4-(3-formyl-4-methoxyphenoxy)-15,16-bis(4-hydroxybutyl)-12-methoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate
    —— 1-(4-fluorophenyl)-7-methyl-2-pyrimidin-2-yl-1H-chromeno[2,3-c]pyrrole-3,9-dione —— C22H14FN3O3
    1-(4-fluorophenyl)-7-methyl-2-pyrimidin-2-yl-1H-chromeno[2,3-c]pyrrole-3,9-dione
    —— 2-Oxopropyl 4-oxochromene-2-carboxylate —— C13H10O5
    2-Oxopropyl 4-oxochromene-2-carboxylate
    —— 7-Docosyl-3-methoxy-5,6-dihydrobenzo[c]xanthen-12-ium —— C40H59O2+
    7-Docosyl-3-methoxy-5,6-dihydrobenzo[c]xanthen-12-ium
    —— [10-[(4-cyanobenzoyl)-propylamino]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-dodecylcarbamate —— C55H80N4O8
    [10-[(4-cyanobenzoyl)-propylamino]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-dodecylcarbamate
    —— but-3-enyl N-[15,16-bis(4-hydroxybutyl)-4-[(6-methylpyridin-2-yl)methoxy]-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylcarbamate —— C47H58N4O10
    but-3-enyl N-[15,16-bis(4-hydroxybutyl)-4-[(6-methylpyridin-2-yl)methoxy]-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylcarbamate
    —— benzyl N-[4-[2-(aziridin-1-yl)ethoxy]-12-ethoxyimino-15,16-bis(4-hydroxybutyl)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate —— C44H61N3O8
    benzyl N-[4-[2-(aziridin-1-yl)ethoxy]-12-ethoxyimino-15,16-bis(4-hydroxybutyl)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylcarbamate
    —— N-[4-[[15,16-bis(4-hydroxybutyl)-12-phenylmethoxyimino-4-(4-phenylphenoxy)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-propylsulfamoyl]phenyl]acetamide —— C57H65N3O9S
    N-[4-[[15,16-bis(4-hydroxybutyl)-12-phenylmethoxyimino-4-(4-phenylphenoxy)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-propylsulfamoyl]phenyl]acetamide
    —— [10-cyclopentylsulfanyl-15,16-bis(4-hydroxybutyl)-12-(oxan-2-yloxyimino)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-ethylcarbamate —— C40H58N2O8S
    [10-cyclopentylsulfanyl-15,16-bis(4-hydroxybutyl)-12-(oxan-2-yloxyimino)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-ethylcarbamate
    —— 1-[4-(Benzyloxy)-3-methoxyphenyl]-7-methyl-2-(4-methyl-1,3-thiazol-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione —— C30H24N2O5S
    1-[4-(Benzyloxy)-3-methoxyphenyl]-7-methyl-2-(4-methyl-1,3-thiazol-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione
    —— 1-[3-(Allyloxy)phenyl]-7-chloro-2-(5-methyl-1,3,4-thiadiazol-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione —— C23H16ClN3O4S
    1-[3-(Allyloxy)phenyl]-7-chloro-2-(5-methyl-1,3,4-thiadiazol-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione
    —— 7-chloro-1-(3,4-dimethoxyphenyl)-2-(pyridin-3-ylmethyl)-1H-chromeno[2,3-c]pyrrole-3,9-dione —— C25H19ClN2O5
    7-chloro-1-(3,4-dimethoxyphenyl)-2-(pyridin-3-ylmethyl)-1H-chromeno[2,3-c]pyrrole-3,9-dione
    —— 2-chloroethyl N-[12-ethoxyimino-15,16-bis(4-hydroxybutyl)-4-(3-nitrophenoxy)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-[(4-fluorophenyl)methyl]carbamate —— C45H53ClFN3O10
    2-chloroethyl N-[12-ethoxyimino-15,16-bis(4-hydroxybutyl)-4-(3-nitrophenoxy)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-[(4-fluorophenyl)methyl]carbamate
    —— N-[4-[2-(aziridin-1-yl)ethoxy]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(1,3-benzodioxol-5-ylmethyl)-3-(4-nitrophenyl)prop-2-enamide —— C52H64N4O11
    N-[4-[2-(aziridin-1-yl)ethoxy]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(1,3-benzodioxol-5-ylmethyl)-3-(4-nitrophenyl)prop-2-enamide
    —— [2-[(3-chlorophenyl)methylsulfanyl]-4,5-dihydroimidazol-1-yl]-(9H-xanthen-9-yl)methanone —— C24H19ClN2O2S
    [2-[(3-chlorophenyl)methylsulfanyl]-4,5-dihydroimidazol-1-yl]-(9H-xanthen-9-yl)methanone
    —— [2-[1-[(2-Chlorophenyl)methyl]-2,5-dimethylpyrrol-3-yl]-2-oxoethyl] 4-oxochromene-2-carboxylate —— C25H20ClNO5
    [2-[1-[(2-Chlorophenyl)methyl]-2,5-dimethylpyrrol-3-yl]-2-oxoethyl] 4-oxochromene-2-carboxylate
    —— N-[15,16-bis(4-hydroxybutyl)-4-(3-nitrophenoxy)-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(naphthalen-1-ylmethyl)cyclopropanecarboxamide —— C55H58N4O11
    N-[15,16-bis(4-hydroxybutyl)-4-(3-nitrophenoxy)-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(naphthalen-1-ylmethyl)cyclopropanecarboxamide
    —— 7-chloro-1-(3,4-dichlorophenyl)-2-(1,3-thiazol-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione —— C20H9Cl3N2O3S
    7-chloro-1-(3,4-dichlorophenyl)-2-(1,3-thiazol-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione
    —— dodecyl N-[4-(3,4-dimethylphenoxy)-15,16-bis(4-hydroxybutyl)-12-methoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylcarbamate —— C50H74N2O8
    dodecyl N-[4-(3,4-dimethylphenoxy)-15,16-bis(4-hydroxybutyl)-12-methoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylcarbamate
    —— 7-Chloro-1-(4-methylphenyl)-2-(4-methylpyridin-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione —— C24H17ClN2O3
    7-Chloro-1-(4-methylphenyl)-2-(4-methylpyridin-2-yl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione
    —— N-[1-(2-imino-6-nitrochromen-3-yl)ethylideneamino]-4-nitroaniline —— C17H13N5O5
    N-[1-(2-imino-6-nitrochromen-3-yl)ethylideneamino]-4-nitroaniline
    —— N-[4-hydroxy-15,16-bis(4-hydroxybutyl)-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(naphthalen-1-ylmethyl)dodecanamide —— C57H73N3O9
    N-[4-hydroxy-15,16-bis(4-hydroxybutyl)-12-[(4-nitrophenyl)methoxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-(naphthalen-1-ylmethyl)dodecanamide
    —— (Z)-N-(6-methoxy-3-(2-methoxyethyl)benzo[d]thiazol-2(3H)-ylidene)-4-oxo-4H-chromene-2-carboxamide —— C21H18N2O5S
    (Z)-N-(6-methoxy-3-(2-methoxyethyl)benzo[d]thiazol-2(3H)-ylidene)-4-oxo-4H-chromene-2-carboxamide
    —— N-[15,16-bis(4-hydroxybutyl)-4-(4-methylsulfanylphenoxy)-12-phenylmethoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propyl-1,3-benzodioxole-5-carboxamide —— C52H60N2O9S
    N-[15,16-bis(4-hydroxybutyl)-4-(4-methylsulfanylphenoxy)-12-phenylmethoxyimino-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propyl-1,3-benzodioxole-5-carboxamide
    —— [10-[(4-cyanobenzoyl)-methylamino]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-ethylcarbamate —— C43H56N4O8
    [10-[(4-cyanobenzoyl)-methylamino]-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-4-yl] N-ethylcarbamate
    —— (Z)-N-(3-(2-ethoxyethyl)-4-fluorobenzo[d]thiazol-2(3H)-ylidene)-4-oxo-4H-chromene-3-carboxamide —— C21H17FN2O4S
    (Z)-N-(3-(2-ethoxyethyl)-4-fluorobenzo[d]thiazol-2(3H)-ylidene)-4-oxo-4H-chromene-3-carboxamide
    —— 2-Ethoxyethyl 2-[3-(4-methylphenoxy)-4-oxochromen-7-yl]oxypropanoate —— C23H24O7
    2-Ethoxyethyl 2-[3-(4-methylphenoxy)-4-oxochromen-7-yl]oxypropanoate
    —— 1-(3-methoxyphenyl)-6,7-dimethyl-2-(5-methylpyridin-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione —— C26H22N2O4
    1-(3-methoxyphenyl)-6,7-dimethyl-2-(5-methylpyridin-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione
    —— methyl 4-(4-methylphenyl)-2-(9H-xanthene-9-carbonylamino)thiophene-3-carboxylate —— C27H21NO4S
    methyl 4-(4-methylphenyl)-2-(9H-xanthene-9-carbonylamino)thiophene-3-carboxylate
    —— Propan-2-yl 2-[4-oxo-3-(2-propan-2-ylphenoxy)chromen-7-yl]oxypropanoate —— C24H26O6
    Propan-2-yl 2-[4-oxo-3-(2-propan-2-ylphenoxy)chromen-7-yl]oxypropanoate
    —— Propyl 2-[4-oxo-3-(2-propan-2-ylphenoxy)chromen-7-yl]oxypropanoate —— C24H26O6
    Propyl 2-[4-oxo-3-(2-propan-2-ylphenoxy)chromen-7-yl]oxypropanoate
    —— 6,7-Dimethyl-2-(5-methylpyridin-2-yl)-1-(3-propoxyphenyl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione —— C28H26N2O4
    6,7-Dimethyl-2-(5-methylpyridin-2-yl)-1-(3-propoxyphenyl)-1,2-dihydrochromeno[2,3-c]pyrrole-3,9-dione
    —— 1-(4-hydroxy-3-methoxyphenyl)-6,7-dimethyl-2-(5-methylpyridin-2-yl)-1H,2H,3H,9H-chromeno[2,3-c]pyrrole-3,9-dione —— C26H22N2O5
    1-(4-hydroxy-3-methoxyphenyl)-6,7-dimethyl-2-(5-methylpyridin-2-yl)-1H,2H,3H,9H-chromeno[2,3-c]pyrrole-3,9-dione
    —— [3-(4-Ethoxycarbonylphenoxy)-4-oxo-2-(trifluoromethyl)chromen-7-yl] 1,3-benzodioxole-5-carboxylate —— C27H17F3O9
    [3-(4-Ethoxycarbonylphenoxy)-4-oxo-2-(trifluoromethyl)chromen-7-yl] 1,3-benzodioxole-5-carboxylate
    —— 4-[4-(3,4-Dimethylphenoxy)-16-(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-10-(2-pyrazin-2-ylethylsulfanyl)-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-15-yl]butan-1-ol —— C45H59N3O6S
    4-[4-(3,4-Dimethylphenoxy)-16-(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-10-(2-pyrazin-2-ylethylsulfanyl)-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-15-yl]butan-1-ol
    —— 1-[15,16-Bis(4-hydroxybutyl)-12-[(4-nitrophenyl)methoxyimino]-4,9-bis(prop-2-enoxy)-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-1,3-dipropylurea —— C44H60N4O9
    1-[15,16-Bis(4-hydroxybutyl)-12-[(4-nitrophenyl)methoxyimino]-4,9-bis(prop-2-enoxy)-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-1,3-dipropylurea
    —— 3-cyclopentyl-N-[4-(3-formyl-4-methoxyphenoxy)-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylpropanamide —— C50H70N2O9
    3-cyclopentyl-N-[4-(3-formyl-4-methoxyphenoxy)-15,16-bis(4-hydroxybutyl)-12-[(2-methylpropan-2-yl)oxyimino]-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-propylpropanamide
    —— N-[12-ethoxyimino-4-hydroxy-15,16-bis(4-hydroxybutyl)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylnaphthalene-2-carboxamide —— C41H50N2O7
    N-[12-ethoxyimino-4-hydroxy-15,16-bis(4-hydroxybutyl)-9-prop-2-enoxy-8-oxatetracyclo[7.7.1.02,7.013,17]heptadeca-2(7),3,5,13-tetraen-10-yl]-N-methylnaphthalene-2-carboxamide
    —— N-[(2-methyl-2H-chromen-3-yl)methylideneamino]pyridine-3-carboxamide —— C17H15N3O2
    N-[(2-methyl-2H-chromen-3-yl)methylideneamino]pyridine-3-carboxamide
    —— 3-methyl-2-(6-nitro-2H-chromen-2-yl)-5-phenyl-2H-1,3-oxazole —— C19H16N2O4
    3-methyl-2-(6-nitro-2H-chromen-2-yl)-5-phenyl-2H-1,3-oxazole
    —— 7'-[(2-Chlorophenyl)amino]-3'-(diethylamino)-6'-methylspiro[2-benzofuran-1,9'-xanthen]-3-one —— C31H27ClN2O3
    7'-[(2-Chlorophenyl)amino]-3'-(diethylamino)-6'-methylspiro[2-benzofuran-1,9'-xanthen]-3-one
    —— N-benzyl-2-[(2-chloroacetyl)-prop-2-enylamino]-N-[(6-methyl-4-oxochromen-3-yl)methyl]acetamide —— C25H25ClN2O4
    N-benzyl-2-[(2-chloroacetyl)-prop-2-enylamino]-N-[(6-methyl-4-oxochromen-3-yl)methyl]acetamide
    —— sulforhodamine B —— C27H29N2O7S2
    sulforhodamine B
    —— [2-(2-methyl-5-piperidin-1-ylsulfonylanilino)-2-oxoethyl] 9H-xanthene-9-carboxylate —— C28H28N2O6S
    [2-(2-methyl-5-piperidin-1-ylsulfonylanilino)-2-oxoethyl] 9H-xanthene-9-carboxylate
    —— (2S,3Z)-2-ethoxy-3-(ethoxymethylidene)-6-nitrochromen-4-one —— C14H15NO6
    (2S,3Z)-2-ethoxy-3-(ethoxymethylidene)-6-nitrochromen-4-one