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中文名称 英文名称 CAS号 化学式 结构式图片
—— 8-Hydroxy-1,2,3-trimethoxyxanthen-9-one —— C16H14O6
8-Hydroxy-1,2,3-trimethoxyxanthen-9-one
—— 8-(1H-indol-3-ylmethyl)-1,4b,7,8,10a-pentamethyl-1,3,4,4a,5,6,7,8a,9,10-decahydrophenanthren-2-one —— C28H39NO
8-(1H-indol-3-ylmethyl)-1,4b,7,8,10a-pentamethyl-1,3,4,4a,5,6,7,8a,9,10-decahydrophenanthren-2-one
—— 8a-hydroxy-4,4-dimethyl-2'-propan-2-ylspiro[2,3,4a,5,6,8-hexahydro-1H-naphthalene-7,5'-cyclohex-2-ene]-1',4'-dione —— C20H30O3
8a-hydroxy-4,4-dimethyl-2'-propan-2-ylspiro[2,3,4a,5,6,8-hexahydro-1H-naphthalene-7,5'-cyclohex-2-ene]-1',4'-dione
—— 8-methyl-10-(3-methylbut-2-enyl)-6a,11a-dihydro-6H-[1]benzofuro[3,2-c]chromene-3,9-diol —— C21H22O4
8-methyl-10-(3-methylbut-2-enyl)-6a,11a-dihydro-6H-[1]benzofuro[3,2-c]chromene-3,9-diol
—— 8-Hydroxy-3-(11-hydroxyundecyl)-6-methoxy-3,4-dihydroisochromen-1-one —— C21H32O5
8-Hydroxy-3-(11-hydroxyundecyl)-6-methoxy-3,4-dihydroisochromen-1-one
—— 8-Hydroxy-1,3-dimethoxy-6-methyl-5-prop-2-enyl-7-(3,4,5-trimethoxyphenyl)bicyclo[3.2.1]oct-3-en-2-one —— C23H30O7
8-Hydroxy-1,3-dimethoxy-6-methyl-5-prop-2-enyl-7-(3,4,5-trimethoxyphenyl)bicyclo[3.2.1]oct-3-en-2-one
—— 8-(Pyridin-3-ylmethyl)-2-[(2,4,5-trimethoxyphenyl)methylidene]-7,9-dihydrofuro[2,3-f][1,3]benzoxazin-3-one —— C26H24N2O6
8-(Pyridin-3-ylmethyl)-2-[(2,4,5-trimethoxyphenyl)methylidene]-7,9-dihydrofuro[2,3-f][1,3]benzoxazin-3-one
—— 8-Hydroxy-1-(6-hydroxy-2,3,4-trimethoxyphenyl)-3,3,7-trimethylcyclopenta[a]naphthalene-2,5-dione —— C25H24O7
8-Hydroxy-1-(6-hydroxy-2,3,4-trimethoxyphenyl)-3,3,7-trimethylcyclopenta[a]naphthalene-2,5-dione
—— 8-Hydroxy-10,14,15-trimethyl-17-(2-methylpropyl)-2-oxa-18-azatricyclo[10.7.0.01,16]nonadeca-10,13-diene-3,6,19-trione —— C24H35NO5
8-Hydroxy-10,14,15-trimethyl-17-(2-methylpropyl)-2-oxa-18-azatricyclo[10.7.0.01,16]nonadeca-10,13-diene-3,6,19-trione
—— 8-(2-Amino-1,2-dihydropyridin-5-yl)-17-[1-(3,7-dihydroxy-13-propyl-9-oxatricyclo[8.5.0.02,8]pentadecan-7-yl)-1-hydroxyethyl]-3,4,11,14-tetrahydroxy-19-(hydroxymethyl)-24-(2-hydroxypropylamino)hexacyclo[11.9.2.111,18.01,6.06,12.014,18]pentacosa-9,13(24)-dien-20-yn-23-one —— C53H77N3O11
8-(2-Amino-1,2-dihydropyridin-5-yl)-17-[1-(3,7-dihydroxy-13-propyl-9-oxatricyclo[8.5.0.02,8]pentadecan-7-yl)-1-hydroxyethyl]-3,4,11,14-tetrahydroxy-19-(hydroxymethyl)-24-(2-hydroxypropylamino)hexacyclo[11.9.2.111,18.01,6.06,12.014,18]pentacosa-9,13(24)-dien-20-yn-23-one
—— 8a-[4,5-Dihydroxy-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]-3-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-3-(3,4,5-trihydroxyoxan-2-yl)oxy-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid —— C52H82O23
8a-[4,5-Dihydroxy-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]-3-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-3-(3,4,5-trihydroxyoxan-2-yl)oxy-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid
—— (8-Methoxy-6-oxobenzo[c]chromen-3-yl) 2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate —— C28H27NO7
(8-Methoxy-6-oxobenzo[c]chromen-3-yl) 2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoate
—— 8'-ethoxy-4',4',6'-trimethyl-2,3,4,9-tetrahydro-4'H-spiro[beta-carboline-1,1'-pyrrolo[3,2,1-ij]quinolin]-2'-one —— C26H27N3O2
8'-ethoxy-4',4',6'-trimethyl-2,3,4,9-tetrahydro-4'H-spiro[beta-carboline-1,1'-pyrrolo[3,2,1-ij]quinolin]-2'-one
—— [8,14,17-Trihydroxy-17-(1-hydroxyethyl)-3-[5-[5-(5-hydroxy-4-methoxy-6-methyloxan-2-yl)oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-10,13-dimethyl-1,2,3,4,5,6,7,9,11,12,15,16-dodecahydrocyclopenta[a]phenanthren-12-yl] benzoate —— C49H76O16
[8,14,17-Trihydroxy-17-(1-hydroxyethyl)-3-[5-[5-(5-hydroxy-4-methoxy-6-methyloxan-2-yl)oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-10,13-dimethyl-1,2,3,4,5,6,7,9,11,12,15,16-dodecahydrocyclopenta[a]phenanthren-12-yl] benzoate
—— 8-Methoxy-3,6,10-trimethyl-5,6,7,8,11,11a-hexahydrocyclodeca[b]furan-2,4-dione —— C16H22O4
8-Methoxy-3,6,10-trimethyl-5,6,7,8,11,11a-hexahydrocyclodeca[b]furan-2,4-dione
—— (8-acetyloxy-3,6-dimethylidene-2-oxo-4,5,6a,7,8,9,9a,9b-octahydro-3aH-azuleno[8,7-b]furan-9-yl)methyl acetate —— C19H24O6
(8-acetyloxy-3,6-dimethylidene-2-oxo-4,5,6a,7,8,9,9a,9b-octahydro-3aH-azuleno[8,7-b]furan-9-yl)methyl acetate
—— (8-Hydroperoxy-3,10,10-trimethyl-7-methylidenecycloundec-3-en-1-yl) 3-(4-hydroxyphenyl)prop-2-enoate —— C24H32O5
(8-Hydroperoxy-3,10,10-trimethyl-7-methylidenecycloundec-3-en-1-yl) 3-(4-hydroxyphenyl)prop-2-enoate
—— 8-[4-[[1-(2-Aminopyridin-4-yl)cyclopentyl]methyl]-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-1-hydroxy-3-[[3-(hydroxymethyl)phenyl]methyl]-4a,9a-dihydroanthracene-9,10-dione —— C39H42N2O10
8-[4-[[1-(2-Aminopyridin-4-yl)cyclopentyl]methyl]-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-1-hydroxy-3-[[3-(hydroxymethyl)phenyl]methyl]-4a,9a-dihydroanthracene-9,10-dione
—— 8,11-Dihydroxy-7-(hydroxymethyl)-6,13-dimethyl-7-azapentacyclo[10.8.0.02,9.05,9.013,18]icosa-14,17-dien-16-one —— C22H31NO4
8,11-Dihydroxy-7-(hydroxymethyl)-6,13-dimethyl-7-azapentacyclo[10.8.0.02,9.05,9.013,18]icosa-14,17-dien-16-one
—— 8-[[2,3,4,6,7,8,9,9a-octahydro-1H-quinolizin-1-ylmethyl(2-methoxyethyl)amino]methyl]-6-chloro-7-hydroxy-4-phenylchromen-2-one —— C29H35ClN2O4
8-[[2,3,4,6,7,8,9,9a-octahydro-1H-quinolizin-1-ylmethyl(2-methoxyethyl)amino]methyl]-6-chloro-7-hydroxy-4-phenylchromen-2-one
—— 8-Cyclohexyl-9-[(2-cyclohexyl-2-hydroxyethyl)amino]-19-[(2,5-dioxopyrrol-1-yl)methyl]-27-(1-ethylcyclopentyl)-4,29-dioxa-10,11-dithia-13,15-diazaoctacyclo[19.11.2.114,18.124,28.01,5.02,20.022,32.031,35]hexatriaconta-2(20),5,14(36),17,27,31(35)-hexaene-3,30-dione —— C56H72N4O7S2
8-Cyclohexyl-9-[(2-cyclohexyl-2-hydroxyethyl)amino]-19-[(2,5-dioxopyrrol-1-yl)methyl]-27-(1-ethylcyclopentyl)-4,29-dioxa-10,11-dithia-13,15-diazaoctacyclo[19.11.2.114,18.124,28.01,5.02,20.022,32.031,35]hexatriaconta-2(20),5,14(36),17,27,31(35)-hexaene-3,30-dione
—— 8-[7,9-bis(hydroxymethyl)-14-tricyclo[9.3.1.04,13]pentadec-2-en-5-ynyl]-19-[(2,5-dioxopyrrol-1-yl)methyl]-26-[(1-ethylcyclopentyl)methylidene]-9-[[1-hydroxy-8-(1H-imidazol-5-ylmethyl)-1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-2-yl]amino]-4,27-dioxa-10,11-dithia-13,15-diazaheptacyclo[19.9.2.114,18.01,5.02,20.022,30.025,29]tritriaconta-2(20),5,14(33),17,25(29)-pentaene-3,28-dione —— C71H88N6O9S2
8-[7,9-bis(hydroxymethyl)-14-tricyclo[9.3.1.04,13]pentadec-2-en-5-ynyl]-19-[(2,5-dioxopyrrol-1-yl)methyl]-26-[(1-ethylcyclopentyl)methylidene]-9-[[1-hydroxy-8-(1H-imidazol-5-ylmethyl)-1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-2-yl]amino]-4,27-dioxa-10,11-dithia-13,15-diazaheptacyclo[19.9.2.114,18.01,5.02,20.022,30.025,29]tritriaconta-2(20),5,14(33),17,25(29)-pentaene-3,28-dione
—— [8-(6-Ethyl-3,5-dimethyl-4-oxopyran-2-yl)-2-[6-(3-hydroxypentan-2-yl)-3,5-dimethyl-4-oxopyran-2-yl]-4,6-dimethyl-5-propanoyloxynon-6-en-3-yl] 3-methylbutanoate —— C40H60O9
[8-(6-Ethyl-3,5-dimethyl-4-oxopyran-2-yl)-2-[6-(3-hydroxypentan-2-yl)-3,5-dimethyl-4-oxopyran-2-yl]-4,6-dimethyl-5-propanoyloxynon-6-en-3-yl] 3-methylbutanoate
—— 8-Hydroxy-4,9,10,14,17,20,20-heptamethyl-24-oxahexacyclo[14.6.2.01,14.04,13.05,10.017,22]tetracosan-23-one —— C30H48O3
8-Hydroxy-4,9,10,14,17,20,20-heptamethyl-24-oxahexacyclo[14.6.2.01,14.04,13.05,10.017,22]tetracosan-23-one
—— (8-methoxy-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)(1-methyl-1H-indol-4-yl)methanone —— C22H21N3O2
(8-methoxy-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)(1-methyl-1H-indol-4-yl)methanone
—— 8-prop-2-enoxy-3,6,7,8,9,9a-hexahydro-2H-pyrido[1,2-a]pyrazine-1,4-dione —— C11H16N2O3
8-prop-2-enoxy-3,6,7,8,9,9a-hexahydro-2H-pyrido[1,2-a]pyrazine-1,4-dione
—— 8a-[6-[[6-[(4-Carboxy-3-hydroxy-3-methylbutanoyl)oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid —— C54H84O24
8a-[6-[[6-[(4-Carboxy-3-hydroxy-3-methylbutanoyl)oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid
—— 8-(4,5-Dihydroxy-2-methoxyphenyl)-5-hydroxy-2,2-dimethyl-7-(3-methylbut-2-enyl)pyrano[3,2-g]chromen-6-one —— C26H26O7
8-(4,5-Dihydroxy-2-methoxyphenyl)-5-hydroxy-2,2-dimethyl-7-(3-methylbut-2-enyl)pyrano[3,2-g]chromen-6-one
—— 8,12-Dihydroxy-3-(2-hydroxypropan-2-yl)-6a,12b-dimethyl-9-(4-methyl-3-oxohexan-2-yl)-8-(2-oxopropyl)-1,2,3,4a,5,6,12,12a-octahydropyrano[3,2-a]xanthen-11-one —— C31H46O8
8,12-Dihydroxy-3-(2-hydroxypropan-2-yl)-6a,12b-dimethyl-9-(4-methyl-3-oxohexan-2-yl)-8-(2-oxopropyl)-1,2,3,4a,5,6,12,12a-octahydropyrano[3,2-a]xanthen-11-one
—— 8,9-dimethoxy-4,4a-dihydro-3H,6H-5,10b-ethanophenanthridin-3-one —— C17H19NO3
8,9-dimethoxy-4,4a-dihydro-3H,6H-5,10b-ethanophenanthridin-3-one
—— 8-O-desmethyl-N-nornitidine —— C19H13NO4
8-O-desmethyl-N-nornitidine
—— (8a-Hydroxy-3,4a,5-trimethyl-4,5,6,7,8,9-hexahydrobenzo[f][1]benzofuran-4-yl) 3-methylbutanoate —— C20H30O4
(8a-Hydroxy-3,4a,5-trimethyl-4,5,6,7,8,9-hexahydrobenzo[f][1]benzofuran-4-yl) 3-methylbutanoate
—— 8-(3-chloro-2-hydroxy-3-methylbutyl)-1,11-dihydroxy-5-methyl-2-prop-1-en-2-yl-2,3-dihydro-1H-pyrano[3,2-a]xanthen-12-one —— C25H27ClO6
8-(3-chloro-2-hydroxy-3-methylbutyl)-1,11-dihydroxy-5-methyl-2-prop-1-en-2-yl-2,3-dihydro-1H-pyrano[3,2-a]xanthen-12-one
—— 8-hydroxy-3,15-dimethoxy-16-[4-(4-methoxy-3-methyl-2-propan-2-yl-3,4-dihydro-2H-pyran-6-yl)pent-3-en-2-yl]-5,7,9,11-tetramethyl-1-oxacyclohexadeca-3,5,11,13-tetraen-2-one —— C36H56O7
8-hydroxy-3,15-dimethoxy-16-[4-(4-methoxy-3-methyl-2-propan-2-yl-3,4-dihydro-2H-pyran-6-yl)pent-3-en-2-yl]-5,7,9,11-tetramethyl-1-oxacyclohexadeca-3,5,11,13-tetraen-2-one
—— 8a-Methyl-5-methylene-3-thiomorpholin-4-ylmethyl-decahydro-naphtho[2,3-b]furan-2-one —— C19H29NO2S
8a-Methyl-5-methylene-3-thiomorpholin-4-ylmethyl-decahydro-naphtho[2,3-b]furan-2-one
—— 8,16-Bis(4-hydroxyphenyl)-9-[4,6,12-trihydroxy-16-(4-hydroxyphenyl)-8-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaen-9-yl]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaene-4,6,12-triol —— C62H52O17
8,16-Bis(4-hydroxyphenyl)-9-[4,6,12-trihydroxy-16-(4-hydroxyphenyl)-8-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaen-9-yl]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaene-4,6,12-triol
—— [8-(1-Acetyloxypropyl)-2-but-1-en-3-ynyl-5,6-dihydroxyoxocan-3-yl] acetate —— C18H26O7
[8-(1-Acetyloxypropyl)-2-but-1-en-3-ynyl-5,6-dihydroxyoxocan-3-yl] acetate
—— 8-[(4-hydroxyphenyl)methyl]-4-(1H-pyrrol-2-ylamino)pentadec-2-enoic acid —— C26H38N2O3
8-[(4-hydroxyphenyl)methyl]-4-(1H-pyrrol-2-ylamino)pentadec-2-enoic acid
—— [8,10-dihydroxy-9-methoxy-6-oxo-3,4-bis[(3,4,5-trihydroxybenzoyl)oxy]-3,4,4a,10b-tetrahydro-2H-pyrano[3,2-c]isochromen-2-yl]methyl 3,4,5-trihydroxybenzoate —— C35H28O21
[8,10-dihydroxy-9-methoxy-6-oxo-3,4-bis[(3,4,5-trihydroxybenzoyl)oxy]-3,4,4a,10b-tetrahydro-2H-pyrano[3,2-c]isochromen-2-yl]methyl 3,4,5-trihydroxybenzoate
—— 8'-benzyl-3'-(ethoxymethyl)-3'-hydroxy-10'-methyl-4-(methylaminomethyl)-1-(N'-methylcarbamimidoyl)spiro[2,4-dihydropyridine-3,11'-tricyclo[5.3.1.01,5]undec-4-ene]-4'-carboxylic acid —— C31H44N4O4
8'-benzyl-3'-(ethoxymethyl)-3'-hydroxy-10'-methyl-4-(methylaminomethyl)-1-(N'-methylcarbamimidoyl)spiro[2,4-dihydropyridine-3,11'-tricyclo[5.3.1.01,5]undec-4-ene]-4'-carboxylic acid
—— [8-Formyl-5-(4-hydroxy-4-methylpent-2-enyl)-1,5-dimethyl-12-oxabicyclo[9.1.0]dodeca-3,7-dien-2-yl] 3-methylbut-2-enoate —— C25H36O5
[8-Formyl-5-(4-hydroxy-4-methylpent-2-enyl)-1,5-dimethyl-12-oxabicyclo[9.1.0]dodeca-3,7-dien-2-yl] 3-methylbut-2-enoate
—— 8-Hydroxy-5,19-dimethyl-15,18,20-trioxapentacyclo[14.5.1.04,13.05,10.019,22]docosa-1(21),10-dien-14-one —— C21H28O5
8-Hydroxy-5,19-dimethyl-15,18,20-trioxapentacyclo[14.5.1.04,13.05,10.019,22]docosa-1(21),10-dien-14-one
—— 8a-(Furan-3-yl)-4,4,6a,6a,11,11,14b-heptamethyl-1,2,3,4a,5,6,8,9,10,13,14,14a-dodecahydropicen-3-ol —— C33H48O2
8a-(Furan-3-yl)-4,4,6a,6a,11,11,14b-heptamethyl-1,2,3,4a,5,6,8,9,10,13,14,14a-dodecahydropicen-3-ol
—— 8-Cyclohexyl-26-[(1-ethylcyclopentyl)methylidene]-4,27-dioxa-10,11-dithia-13,15-diazaheptacyclo[19.9.2.114,18.01,5.02,20.022,30.025,29]tritriaconta-2(20),5,14(33),17,25(29)-pentaene-3,28-dione —— C41H52N2O4S2
8-Cyclohexyl-26-[(1-ethylcyclopentyl)methylidene]-4,27-dioxa-10,11-dithia-13,15-diazaheptacyclo[19.9.2.114,18.01,5.02,20.022,30.025,29]tritriaconta-2(20),5,14(33),17,25(29)-pentaene-3,28-dione
—— 8-(3-Heptyloxiran-2-yl)-1-methoxyocta-4,6-diyn-3-one —— C18H26O3
8-(3-Heptyloxiran-2-yl)-1-methoxyocta-4,6-diyn-3-one
—— 8-Pentadec-11-enyl-1,5,9,13-tetrazacycloheptadecan-6-one —— C28H56N4O
8-Pentadec-11-enyl-1,5,9,13-tetrazacycloheptadecan-6-one
—— 8-(2-Methoxyphenyl)-2-methyl-4-(4-methylphenyl)-4,6,16-triazatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),10,12,14-tetraene-3,5-dione —— C28H25N3O3
8-(2-Methoxyphenyl)-2-methyl-4-(4-methylphenyl)-4,6,16-triazatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),10,12,14-tetraene-3,5-dione
—— 8,17-Dihydroxy-1-methyl-14-oxapentacyclo[11.6.1.02,11.04,9.016,20]icosa-2(11),3,5,7,9,13(20)-hexaen-12-one —— C20H18O4
8,17-Dihydroxy-1-methyl-14-oxapentacyclo[11.6.1.02,11.04,9.016,20]icosa-2(11),3,5,7,9,13(20)-hexaen-12-one
—— 8-[6-[[3,4-Dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxymethyl]-3,4,5-trihydroxyoxan-2-yl]-7-hydroxy-3-(4-hydroxyphenyl)chromen-4-one —— C26H28O13
8-[6-[[3,4-Dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxymethyl]-3,4,5-trihydroxyoxan-2-yl]-7-hydroxy-3-(4-hydroxyphenyl)chromen-4-one
—— 8-[2-(4-Fluorophenyl)ethyl]-2-(pyridin-3-ylmethylidene)-7,9-dihydrofuro[2,3-f][1,3]benzoxazin-3-one —— C24H19FN2O3
8-[2-(4-Fluorophenyl)ethyl]-2-(pyridin-3-ylmethylidene)-7,9-dihydrofuro[2,3-f][1,3]benzoxazin-3-one