摩熵化学
数据库官网
小程序
打开微信扫一扫
首页 分子通 化学资讯 化学百科 反应查询 关于我们
请输入关键词
中文名称 英文名称 CAS号 化学式 结构式图片
—— [8-Ethoxy-11-ethyl-5-hydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecan-4-yl] benzoate —— C34H49NO8
[8-Ethoxy-11-ethyl-5-hydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecan-4-yl] benzoate
—— [8-(3-Benzyl-6,6-dimethyl-2,5,8,11-tetraoxo-1,4,7,10-tetrazabicyclo[10.3.0]pentadecan-9-yl)-3-oxooctan-2-yl] acetate —— C30H42N4O7
[8-(3-Benzyl-6,6-dimethyl-2,5,8,11-tetraoxo-1,4,7,10-tetrazabicyclo[10.3.0]pentadecan-9-yl)-3-oxooctan-2-yl] acetate
—— 8,19-Dibutyl-4,15-dichloro-13-methoxytricyclo[18.2.2.29,12]hexacosa-1(22),9,11,20,23,25-hexaene-2,10,21,24,26-pentol —— C35H52Cl2O6
8,19-Dibutyl-4,15-dichloro-13-methoxytricyclo[18.2.2.29,12]hexacosa-1(22),9,11,20,23,25-hexaene-2,10,21,24,26-pentol
—— 8-chloro-3-propyl-2,3,3a,4,5,6-hexahydro-1H-pyrazino[3,2,1-jk]carbazole —— C17H21ClN2
8-chloro-3-propyl-2,3,3a,4,5,6-hexahydro-1H-pyrazino[3,2,1-jk]carbazole
—— 8-Methoxy-2-phenyl-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one —— C22H22O9
8-Methoxy-2-phenyl-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one
—— [8,14,17-Trihydroxy-17-(1-hydroxyethyl)-3-[5-[5-[5-[3-hydroxy-4-methoxy-5-[4-methoxy-6-methyl-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-10,13-dimethyl-1,2,3,4,7,9,11,12,15,16-decahydrocyclopenta[a]phenanthren-12-yl] 2-methylbut-2-enoate —— C67H110O28
[8,14,17-Trihydroxy-17-(1-hydroxyethyl)-3-[5-[5-[5-[3-hydroxy-4-methoxy-5-[4-methoxy-6-methyl-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-10,13-dimethyl-1,2,3,4,7,9,11,12,15,16-decahydrocyclopenta[a]phenanthren-12-yl] 2-methylbut-2-enoate
—— 8-hydroxy-7-methoxynaphtho-<2,3-b>furan-4,9-quinone 133632-63-0 C13H8O5
8-hydroxy-7-methoxynaphtho-<2,3-b>furan-4,9-quinone
—— 8-(2,6-Dihydroxyphenyl)-5-(hydroxymethyl)-2,2-dimethyl-10-(3-methylbut-2-enyl)-7,8-dihydropyrano[3,2-g]chromen-6-one —— C26H28O6
8-(2,6-Dihydroxyphenyl)-5-(hydroxymethyl)-2,2-dimethyl-10-(3-methylbut-2-enyl)-7,8-dihydropyrano[3,2-g]chromen-6-one
—— 8-Methyl-11-propan-2-yl-2-oxatricyclo[6.3.1.04,12]dodecane-4,7-diol —— C15H26O3
8-Methyl-11-propan-2-yl-2-oxatricyclo[6.3.1.04,12]dodecane-4,7-diol
—— (8,9-Dihydroxy-9-methyl-3,6-dimethylidene-2-oxo-3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-4-yl) 2-(hydroxymethyl)prop-2-enoate —— C19H24O7
(8,9-Dihydroxy-9-methyl-3,6-dimethylidene-2-oxo-3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-4-yl) 2-(hydroxymethyl)prop-2-enoate
—— 8-Desmethylkalmiatin —— C19H18O6
8-Desmethylkalmiatin
—— 8,15'-dihydroxy-2',5,8a,11'-tetramethyl-7'-methylidenespiro[4,6,7,8,9,9a-hexahydro-3aH-benzo[f][1]benzofuran-3,13'-5-oxatetracyclo[10.2.1.01,10.04,8]pentadec-10-ene]-2,6'-dione —— C30H38O6
8,15'-dihydroxy-2',5,8a,11'-tetramethyl-7'-methylidenespiro[4,6,7,8,9,9a-hexahydro-3aH-benzo[f][1]benzofuran-3,13'-5-oxatetracyclo[10.2.1.01,10.04,8]pentadec-10-ene]-2,6'-dione
—— [8a-(hydroxymethyl)-1-methyl-2,5,8-trioxo-6,7-dihydro-3H-imidazo[1,2-a]pyrazin-6-yl]methyl 2-hydroxy-2-(hydroxymethyl)-3-oxo-4H-1,4-benzoxazine-5-carboxylate —— C19H20N4O10
[8a-(hydroxymethyl)-1-methyl-2,5,8-trioxo-6,7-dihydro-3H-imidazo[1,2-a]pyrazin-6-yl]methyl 2-hydroxy-2-(hydroxymethyl)-3-oxo-4H-1,4-benzoxazine-5-carboxylate
—— (8-Acetyloxy-3,4a,5-trimethyl-9-oxo-4,5,6,7,8,8a-hexahydrobenzo[f][1]benzofuran-4-yl) 2-methylbut-2-enoate —— C22H28O6
(8-Acetyloxy-3,4a,5-trimethyl-9-oxo-4,5,6,7,8,8a-hexahydrobenzo[f][1]benzofuran-4-yl) 2-methylbut-2-enoate
—— 8-[2-(furan-3-yl)ethyl]-4,7,8,8a-tetramethyl-4a,5,6,7-tetrahydro-1H-naphthalen-2-one —— C20H28O2
8-[2-(furan-3-yl)ethyl]-4,7,8,8a-tetramethyl-4a,5,6,7-tetrahydro-1H-naphthalen-2-one
—— 8-(1-(3,4-dimethoxyphenyl)-3-morpholino-3-oxopropyl)-5,6,7-trihydroxy-2-phenyl-4H-chromen-4-one —— C30H29NO9
8-(1-(3,4-dimethoxyphenyl)-3-morpholino-3-oxopropyl)-5,6,7-trihydroxy-2-phenyl-4H-chromen-4-one
—— 8-hydroxy-3,5-dimethyl-3,4-dihydro-2H-naphthalen-1-one —— C12H14O2
8-hydroxy-3,5-dimethyl-3,4-dihydro-2H-naphthalen-1-one
—— 8-(7-methyl-4-(morfolinomethyl)furo[2,3-c]pyridin-2-yl)-6H-[1,3]dioxolo[4,5-g]chromen-6-one —— C23H20N2O6
8-(7-methyl-4-(morfolinomethyl)furo[2,3-c]pyridin-2-yl)-6H-[1,3]dioxolo[4,5-g]chromen-6-one
—— 8-Hydroxy-8-(hydroxymethyl)-2,2-dimethyltricyclo[5.3.1.04,11]undecane-4-carboxylic acid —— C15H24O4
8-Hydroxy-8-(hydroxymethyl)-2,2-dimethyltricyclo[5.3.1.04,11]undecane-4-carboxylic acid
—— 8-Methylsulfonyl-1'-(pyridin-3-ylmethyl)spiro[1,3,4,7,9,9a-hexahydropyrazino[2,1-c][1,4]oxazine-6,3'-azetidine] —— C16H24N4O3S
8-Methylsulfonyl-1'-(pyridin-3-ylmethyl)spiro[1,3,4,7,9,9a-hexahydropyrazino[2,1-c][1,4]oxazine-6,3'-azetidine]
—— 8-hydroxy-3-(4-hydroxyphenyl)-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]-6-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4H-naphthalen-1-one —— C28H32O14
8-hydroxy-3-(4-hydroxyphenyl)-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]-6-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4H-naphthalen-1-one
—— 8a-[4,5-Diacetyloxy-3-[5-[3,4-dihydroxy-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxycarbonyl-3-[4,5-dihydroxy-6-(hydroxymethyl)-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2-hydroxy-6b-(hydroxymethyl)-4,6a,11,11,14b-pentamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid —— C69H108O36
8a-[4,5-Diacetyloxy-3-[5-[3,4-dihydroxy-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxycarbonyl-3-[4,5-dihydroxy-6-(hydroxymethyl)-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2-hydroxy-6b-(hydroxymethyl)-4,6a,11,11,14b-pentamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid
—— [8b-hydroxy-2-(4-hydroxybutylcarbamoyl)-6,8-dimethoxy-3a-(4-methoxyphenyl)-3-phenyl-2,3-dihydro-1H-cyclopenta[b][1]benzofuran-1-yl] acetate —— C33H37NO9
[8b-hydroxy-2-(4-hydroxybutylcarbamoyl)-6,8-dimethoxy-3a-(4-methoxyphenyl)-3-phenyl-2,3-dihydro-1H-cyclopenta[b][1]benzofuran-1-yl] acetate
—— 8-Hydroxy-6-heneicosanone —— C21H42O2
8-Hydroxy-6-heneicosanone
—— 8-methoxy-4,4,6-trimethyl-1'H,4H-spiro[pyrrolo[3,2,1-ij]quinoline-1,2'-quinazoline]-2,4'(3'H)-dione —— C22H21N3O3
8-methoxy-4,4,6-trimethyl-1'H,4H-spiro[pyrrolo[3,2,1-ij]quinoline-1,2'-quinazoline]-2,4'(3'H)-dione
—— [8-Acetyloxy-5,7,14-trihydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadec-11-en-4-yl] benzoate —— C32H41NO11
[8-Acetyloxy-5,7,14-trihydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadec-11-en-4-yl] benzoate
—— 8,9-Dihydroxy-4-(4-hydroxy-4-methylpent-2-enylidene)-7,11-dimethylidene-1,4a,5,6,8,9,10,11a-octahydrocyclonona[c]pyran-3-one —— C20H28O5
8,9-Dihydroxy-4-(4-hydroxy-4-methylpent-2-enylidene)-7,11-dimethylidene-1,4a,5,6,8,9,10,11a-octahydrocyclonona[c]pyran-3-one
—— 8-[4-(3-Hydroxyprop-1-enyl)-2,6-dimethoxyphenoxy]-4-(methoxymethyl)-2,6-dimethylocta-4,6-dien-2-ol —— C23H34O6
8-[4-(3-Hydroxyprop-1-enyl)-2,6-dimethoxyphenoxy]-4-(methoxymethyl)-2,6-dimethylocta-4,6-dien-2-ol
—— [8-Hydroxy-17-(hydroxymethyl)-10-methyl-3-methylidene-2,15-dioxo-7,14-dioxapentacyclo[7.6.2.11,4.06,16.013,17]octadecan-10-yl]methyl acetate —— C22H28O8
[8-Hydroxy-17-(hydroxymethyl)-10-methyl-3-methylidene-2,15-dioxo-7,14-dioxapentacyclo[7.6.2.11,4.06,16.013,17]octadecan-10-yl]methyl acetate
—— 8-methyl-2-oxo-4-phenyl-2H-chromen-7-yl N-(tert-butoxycarbonyl)norvalinate —— C26H29NO6
8-methyl-2-oxo-4-phenyl-2H-chromen-7-yl N-(tert-butoxycarbonyl)norvalinate
—— 8a-O-[6-[[4,5-dihydroxy-6-(hydroxymethyl)-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-3,5-dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl] 4-O-(2-hydroxypropyl) 3-hydroxy-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4,8a-dicarboxylate —— C57H92O26
8a-O-[6-[[4,5-dihydroxy-6-(hydroxymethyl)-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-3,5-dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl] 4-O-(2-hydroxypropyl) 3-hydroxy-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4,8a-dicarboxylate
—— 8-(Hydroxymethyl)-3a,5a-dimethyl-1-propan-2-yl-4,5,6,7,10,10a-hexahydrocyclohepta[e]indene-6,7-diol —— C20H30O3
8-(Hydroxymethyl)-3a,5a-dimethyl-1-propan-2-yl-4,5,6,7,10,10a-hexahydrocyclohepta[e]indene-6,7-diol
—— 8a-Methyl-5-methylidene-3-prop-1-en-2-yl-1,2,3,4,4a,8-hexahydronaphthalene —— C15H22
8a-Methyl-5-methylidene-3-prop-1-en-2-yl-1,2,3,4,4a,8-hexahydronaphthalene
—— 8-(5,5,8a-trimethyl-2-methylidene-3,4,4a,6,7,8-hexahydro-1H-naphthalen-1-yl)-6-methyloct-5-en-2-ol —— C23H40O
8-(5,5,8a-trimethyl-2-methylidene-3,4,4a,6,7,8-hexahydro-1H-naphthalen-1-yl)-6-methyloct-5-en-2-ol
—— [8-[7-hydroxy-7-methyl-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4a,5,6,7a-tetrahydro-1H-cyclopenta[c]pyran-4-carbonyl]oxy-3,7-dimethyloctyl] 7-hydroxy-7-methyl-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4a,5,6,7a-tetrahydro-1H-cyclopenta[c]pyran-4-carboxylate —— C42H66O20
[8-[7-hydroxy-7-methyl-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4a,5,6,7a-tetrahydro-1H-cyclopenta[c]pyran-4-carbonyl]oxy-3,7-dimethyloctyl] 7-hydroxy-7-methyl-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4a,5,6,7a-tetrahydro-1H-cyclopenta[c]pyran-4-carboxylate
—— 8-[(4-Hydroxyphenyl)methyl]-14-methyl-15-oxopentadec-2-enoic acid —— C23H34O4
8-[(4-Hydroxyphenyl)methyl]-14-methyl-15-oxopentadec-2-enoic acid
—— (8-Hydroxy-8a-methyl-3,5-dimethylidene-2-oxo-3a,4,4a,6,7,8,9,9a-octahydrobenzo[f][1]benzofuran-6-yl) 2-methylpropanoate —— C19H26O5
(8-Hydroxy-8a-methyl-3,5-dimethylidene-2-oxo-3a,4,4a,6,7,8,9,9a-octahydrobenzo[f][1]benzofuran-6-yl) 2-methylpropanoate
—— 8,14-Dihydroxy-6,7,11-trimethyl-4-(2-methylpropyl)-3-azatricyclo[7.7.0.01,5]hexadeca-6,11-diene-2,16-dione —— C22H33NO4
8,14-Dihydroxy-6,7,11-trimethyl-4-(2-methylpropyl)-3-azatricyclo[7.7.0.01,5]hexadeca-6,11-diene-2,16-dione
—— (8-Ethyl-3-hydroxy-3,5b,8,11a,13a-pentamethyl-1-oxo-5a,6,7,7a,9,10,11,11b,12,13-decahydrophenanthro[2,1-e][2]benzofuran-13-yl) 3-hydroxy-4-methylpentanoate —— C33H50O6
(8-Ethyl-3-hydroxy-3,5b,8,11a,13a-pentamethyl-1-oxo-5a,6,7,7a,9,10,11,11b,12,13-decahydrophenanthro[2,1-e][2]benzofuran-13-yl) 3-hydroxy-4-methylpentanoate
—— 8-(1,2-Dihydroxyethyl)-4-(3,4-dihydroxyphenyl)-9-hydroxy-1,7-dioxaspiro[4.4]nonane-2,6-dione —— C15H16O9
8-(1,2-Dihydroxyethyl)-4-(3,4-dihydroxyphenyl)-9-hydroxy-1,7-dioxaspiro[4.4]nonane-2,6-dione
—— 8-[1-(1,2,4a,5,5a,6,7,8,9,9a,10,10a-Dodecahydropyrido[3,4-g]quinolin-10-ylmethyl)-3-(2-hydroxypropylamino)cyclopentyl]-1-[2-[[6-amino-4-[2-[3-(2-phenylethyl)phenyl]ethyl]pyridin-3-yl]methyl]-4-hydroxy-5-(hydroxymethoxy)phenyl]oct-1-ene-3,5-dione —— C58H75N5O6
8-[1-(1,2,4a,5,5a,6,7,8,9,9a,10,10a-Dodecahydropyrido[3,4-g]quinolin-10-ylmethyl)-3-(2-hydroxypropylamino)cyclopentyl]-1-[2-[[6-amino-4-[2-[3-(2-phenylethyl)phenyl]ethyl]pyridin-3-yl]methyl]-4-hydroxy-5-(hydroxymethoxy)phenyl]oct-1-ene-3,5-dione
—— 8-(7-methyl-4-{[(2-methylpropyl)amino]methyl}furo[2,3-c]pyridin-2-yl)-6H-[1,3]dioxolo[4,5-g]chromen-6-one —— C23H22N2O5
8-(7-methyl-4-{[(2-methylpropyl)amino]methyl}furo[2,3-c]pyridin-2-yl)-6H-[1,3]dioxolo[4,5-g]chromen-6-one
—— 8-O-methyl-tetracenomycin D3 —— C21H14O8
8-O-methyl-tetracenomycin D3
—— 8-(2,3-Dihydroxy-3-methylbutyl)-5,7-dihydroxy-6-(2-methylbutanoyl)-4-phenylchromen-2-one —— C25H28O7
8-(2,3-Dihydroxy-3-methylbutyl)-5,7-dihydroxy-6-(2-methylbutanoyl)-4-phenylchromen-2-one
—— 8-(hydroxymethyl)-32-(3-hydroxypropyl)-18-(2H-indol-5-ylmethyl)-24-(methylamino)-23-(methylaminomethoxy)-3,9,29-trioxaheptacyclo[28.3.1.02,23.04,21.05,10.011,20.012,17]tetratriaconta-1(33),4,10,12(17),13,15,20,30(34),31-nonaen-25-yne-15,31-diol —— C47H51N3O8
8-(hydroxymethyl)-32-(3-hydroxypropyl)-18-(2H-indol-5-ylmethyl)-24-(methylamino)-23-(methylaminomethoxy)-3,9,29-trioxaheptacyclo[28.3.1.02,23.04,21.05,10.011,20.012,17]tetratriaconta-1(33),4,10,12(17),13,15,20,30(34),31-nonaen-25-yne-15,31-diol
—— 8-(5-Hydroxy-2,6,6-trimethylcyclohex-2-en-1-yl)-6-methyloct-5-en-2-one —— C18H30O2
8-(5-Hydroxy-2,6,6-trimethylcyclohex-2-en-1-yl)-6-methyloct-5-en-2-one
—— (8,18,24-Trihydroxy-14-methoxy-10,16,24-trimethyl-6,12,20-trioxo-5,21,25-trioxaoctacyclo[13.10.2.13,7.13,13.02,14.019,27.022,26.011,29]nonacosa-1(26),7,9,11(29),15(27),16,18-heptaen-28-yl) acetate —— C32H28O12
(8,18,24-Trihydroxy-14-methoxy-10,16,24-trimethyl-6,12,20-trioxo-5,21,25-trioxaoctacyclo[13.10.2.13,7.13,13.02,14.019,27.022,26.011,29]nonacosa-1(26),7,9,11(29),15(27),16,18-heptaen-28-yl) acetate
—— 8,10,14-trimethyl-17-[6-methyl-2-[3,4,5-trihydroxy-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxyhept-5-en-2-yl]-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,3,4,5,6,7,9,11,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-12-one —— C46H76O18
8,10,14-trimethyl-17-[6-methyl-2-[3,4,5-trihydroxy-6-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl]oxyhept-5-en-2-yl]-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,3,4,5,6,7,9,11,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-12-one
—— 8-Hydroxy-6-methoxy-3-methyl-7-[3-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybut-2-enyl]chromen-4-one —— C22H28O10
8-Hydroxy-6-methoxy-3-methyl-7-[3-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybut-2-enyl]chromen-4-one
—— 8-[2-(3-Benzylphenyl)ethyl]-5,7-dihydroxy-2-(4-hydroxyphenyl)-6-methoxychromen-4-one —— C31H26O6
8-[2-(3-Benzylphenyl)ethyl]-5,7-dihydroxy-2-(4-hydroxyphenyl)-6-methoxychromen-4-one