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木脂素、新木脂素和相关化合物

中文名称 英文名称 CAS号 化学式 结构式图片
—— 10,10-Dimethyl-7,14-diphenyl-21-(5,9,9-trimethyl-5,6-dihydrofluoren-2-yl)-10-silapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1(21),2,4(9),5,7,11,13,15,17,19-decaene —— C50H42Si
10,10-Dimethyl-7,14-diphenyl-21-(5,9,9-trimethyl-5,6-dihydrofluoren-2-yl)-10-silapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1(21),2,4(9),5,7,11,13,15,17,19-decaene
—— 6-[3-(3-Ethylpent-1-ynyl)phenyl]-3-[3-(3-propylhex-1-ynyl)phenyl]hexane-1,4-diamine —— C34H48N2
6-[3-(3-Ethylpent-1-ynyl)phenyl]-3-[3-(3-propylhex-1-ynyl)phenyl]hexane-1,4-diamine
—— (E)-4-(4-fluorophenyl)-1,2-diphenylbut-2-ene-1,4-dione —— C22H15FO2
(E)-4-(4-fluorophenyl)-1,2-diphenylbut-2-ene-1,4-dione
—— 1-(deuteriomethoxy)-2-[(E)-5-(1-ethylcyclopropyl)-3-[(4-methylphenyl)methyl]pent-1-enyl]benzene;ethane —— C29H44O
1-(deuteriomethoxy)-2-[(E)-5-(1-ethylcyclopropyl)-3-[(4-methylphenyl)methyl]pent-1-enyl]benzene;ethane
—— cis,trans-α,α'-Dipiperonyliden-bernsteinsaeure-dimethylester 14952-59-1 C22H18O8
cis,trans-α,α'-Dipiperonyliden-bernsteinsaeure-dimethylester
—— 4-Butan-2-ylphenol;2-[1-[4-[7-(4-tert-butylphenyl)-5-(4-hydroxyphenyl)octan-3-yl]phenoxy]ethoxy]ethyl thiophene-2-carboxylate;3-methylpentan-2-one —— C65H88O8S
4-Butan-2-ylphenol;2-[1-[4-[7-(4-tert-butylphenyl)-5-(4-hydroxyphenyl)octan-3-yl]phenoxy]ethoxy]ethyl thiophene-2-carboxylate;3-methylpentan-2-one
—— (2R)-2-[(2S,3R,4S)-3-benzoyl-3,4,5-trihydroxy-4,5-bis(2-phenoxyacetyl)oxolan-2-yl]-2,4-dihydroxy-1,4-diphenylbutane-1,3-dione —— C43H36O13
(2R)-2-[(2S,3R,4S)-3-benzoyl-3,4,5-trihydroxy-4,5-bis(2-phenoxyacetyl)oxolan-2-yl]-2,4-dihydroxy-1,4-diphenylbutane-1,3-dione
—— 3-benzyl-4-[(Z)-N-(2,4-dinitroanilino)-C-phenylcarbonimidoyl]oxolan-2-one —— C24H20N4O6
3-benzyl-4-[(Z)-N-(2,4-dinitroanilino)-C-phenylcarbonimidoyl]oxolan-2-one
—— 9-(1,3-benzodioxol-5-yl)-4-(3-hydroxy-5-methoxy-4-methyloxan-2-yl)oxy-6,7-dimethoxy-3H-benzo[f][2]benzofuran-1-one —— C28H28O10
9-(1,3-benzodioxol-5-yl)-4-(3-hydroxy-5-methoxy-4-methyloxan-2-yl)oxy-6,7-dimethoxy-3H-benzo[f][2]benzofuran-1-one
—— (1R)-1-(3-amino-4-phenylmethoxyphenyl)-2-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]ethanol —— C51H50N2O4
(1R)-1-(3-amino-4-phenylmethoxyphenyl)-2-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]ethanol
—— ethyl (4E)-4-(1,3-benzodioxol-5-yl)-4-[(2,4-dinitrophenyl)hydrazinylidene]-2-[(3,4,5-trimethoxyphenyl)methyl]butanoate —— C29H30N4O11
ethyl (4E)-4-(1,3-benzodioxol-5-yl)-4-[(2,4-dinitrophenyl)hydrazinylidene]-2-[(3,4,5-trimethoxyphenyl)methyl]butanoate
—— 2-(hydroxymethyl)-6-[4-[(1E)-3-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]penta-1,4-dienyl]phenoxy]oxane-3,4,5-triol —— C29H36O12
2-(hydroxymethyl)-6-[4-[(1E)-3-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]penta-1,4-dienyl]phenoxy]oxane-3,4,5-triol
—— 2-[4-(1-oxo-2,3-dihydroinden-5-yl)phenyl]-2-[4-(2-piperidin-1-ylethoxy)phenyl]-3H-pyrrol-4-one —— C32H32N2O3
2-[4-(1-oxo-2,3-dihydroinden-5-yl)phenyl]-2-[4-(2-piperidin-1-ylethoxy)phenyl]-3H-pyrrol-4-one
—— 3-[7-(1,3,2-Dioxaborolan-2-yl)-2',7'-bis(3-methylnonan-3-yl)-9,9'-spirobi[fluorene]-2-yl]propylphosphane —— C50H65BO2P+
3-[7-(1,3,2-Dioxaborolan-2-yl)-2',7'-bis(3-methylnonan-3-yl)-9,9'-spirobi[fluorene]-2-yl]propylphosphane
—— 3-[7-(1,3,2-dioxaborolan-2-yl)-2',7'-bis(3-methylnonan-3-yl)-9,9'-spirobi[fluorene]-2-yl]propylphosphane —— C50H66BO2P
3-[7-(1,3,2-dioxaborolan-2-yl)-2',7'-bis(3-methylnonan-3-yl)-9,9'-spirobi[fluorene]-2-yl]propylphosphane
—— 1-(3,4-Dimethoxyphenyl)-2-[4-[5-[4-[1-(3,4-dimethoxyphenyl)-1-hydroxypropan-2-yl]oxy-3-methoxyphenyl]-4-ethyl-3-methyloxolan-2-yl]-2-methoxyphenoxy]propan-1-ol —— C43H54O11
1-(3,4-Dimethoxyphenyl)-2-[4-[5-[4-[1-(3,4-dimethoxyphenyl)-1-hydroxypropan-2-yl]oxy-3-methoxyphenyl]-4-ethyl-3-methyloxolan-2-yl]-2-methoxyphenoxy]propan-1-ol
—— 2-(5-Fluoro-2,4-dimethylphenyl)-3-(5-methylpyridin-2-yl)-4-phenylhex-2-enamide —— C26H27FN2O
2-(5-Fluoro-2,4-dimethylphenyl)-3-(5-methylpyridin-2-yl)-4-phenylhex-2-enamide
—— N-(4-carbazol-9-ylphenyl)-N-phenyl-4-(2-phenylanthracen-9-yl)aniline —— C50H34N2
N-(4-carbazol-9-ylphenyl)-N-phenyl-4-(2-phenylanthracen-9-yl)aniline
—— 3-Anthracen-9-yl-6,6,19,19-tetramethylpentacyclo[13.3.1.05,18.07,17.010,16]nonadeca-1,3,5(18),9,12,14,16-heptaene —— C37H32
3-Anthracen-9-yl-6,6,19,19-tetramethylpentacyclo[13.3.1.05,18.07,17.010,16]nonadeca-1,3,5(18),9,12,14,16-heptaene
—— 4-(9,10-Dihydrofluoranthen-8-yl)-7,12-diphenyl-3-propan-2-yl-1,2-dihydrobenzo[k]fluoranthene —— C51H38
4-(9,10-Dihydrofluoranthen-8-yl)-7,12-diphenyl-3-propan-2-yl-1,2-dihydrobenzo[k]fluoranthene
—— 10-[3-[2,3-bis(ethenyl)naphthalen-1-yl]-5-[10-(4-methyl-N-(4-methylphenyl)anilino)-1,2-dihydroanthracen-9-yl]phenyl]-N,N-bis(4-methylphenyl)anthracen-9-amine;4-methyl-N-(4-methylcyclohexa-2,4-dien-1-yl)-N-[[6-[[3-methyl-5-[[6-[(4-methyl-N-(4-methylcyclohexa-1,3-dien-1-yl)anilino)-phenylmethylidene]cyclohexa-2,4-dien-1-ylidene]methyl]phenyl]-phenylmethylidene]cyclohexa-2,4-dien-1-ylidene]methyl]aniline —— C139H118N4
10-[3-[2,3-bis(ethenyl)naphthalen-1-yl]-5-[10-(4-methyl-N-(4-methylphenyl)anilino)-1,2-dihydroanthracen-9-yl]phenyl]-N,N-bis(4-methylphenyl)anthracen-9-amine;4-methyl-N-(4-methylcyclohexa-2,4-dien-1-yl)-N-[[6-[[3-methyl-5-[[6-[(4-methyl-N-(4-methylcyclohexa-1,3-dien-1-yl)anilino)-phenylmethylidene]cyclohexa-2,4-dien-1-ylidene]methyl]phenyl]-phenylmethylidene]cyclohexa-2,4-dien-1-ylidene]methyl]aniline
—— (2S)-1-[3-(aminomethyl)-4-phenylmethoxyphenoxy]-3-[[4,4-bis(4-methoxyphenyl)-1-phenylbutan-2-yl]amino]propan-2-ol —— C41H46N2O5
(2S)-1-[3-(aminomethyl)-4-phenylmethoxyphenoxy]-3-[[4,4-bis(4-methoxyphenyl)-1-phenylbutan-2-yl]amino]propan-2-ol
—— 9-Methylbenzo[a]phenoxazin-5-one;5,6,11,12-tetraphenyltetracene —— C59H39NO2
9-Methylbenzo[a]phenoxazin-5-one;5,6,11,12-tetraphenyltetracene
—— 2-[2-Methyl-4-[4-methyl-3-(3-methylbuta-1,3-dienyl)phenyl]phenyl]-6,9-dinaphthalen-2-yl-10-phenyl-3-propan-2-ylanthracene —— C62H50
2-[2-Methyl-4-[4-methyl-3-(3-methylbuta-1,3-dienyl)phenyl]phenyl]-6,9-dinaphthalen-2-yl-10-phenyl-3-propan-2-ylanthracene
—— (4S,6S)-6-[2-[(2R,3R)-3-[2-(4-fluorophenyl)-2-oxoethyl]sulfanyl-4-oxo-1-phenylazetidin-2-yl]-5-[4-[(3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]phenyl]phenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid —— C41H40FNO14S
(4S,6S)-6-[2-[(2R,3R)-3-[2-(4-fluorophenyl)-2-oxoethyl]sulfanyl-4-oxo-1-phenylazetidin-2-yl]-5-[4-[(3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]phenyl]phenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
—— (2S)-1-(3-nitro-4-phenylmethoxyphenoxy)-3-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]propan-2-ol —— C52H50N2O7
(2S)-1-(3-nitro-4-phenylmethoxyphenoxy)-3-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]propan-2-ol
—— 11-[7-[3-[6-[1-[5-[[1-[7-(3-Ethenylpenta-1,3-dienyl)-9,9-dimethylfluoren-2-yl]-2-(3-methylbuta-1,3-dienyl)-1-benzazepin-3-yl]methyl]benzo[b][1]benzazepin-11-yl]ethylidene]cyclohexa-2,4-dien-1-ylidene]pent-1-enyl]-9,9-dimethylfluoren-2-yl]-3,4-didehydrobenzo[b][1]benzazepine —— C94H79N3
11-[7-[3-[6-[1-[5-[[1-[7-(3-Ethenylpenta-1,3-dienyl)-9,9-dimethylfluoren-2-yl]-2-(3-methylbuta-1,3-dienyl)-1-benzazepin-3-yl]methyl]benzo[b][1]benzazepin-11-yl]ethylidene]cyclohexa-2,4-dien-1-ylidene]pent-1-enyl]-9,9-dimethylfluoren-2-yl]-3,4-didehydrobenzo[b][1]benzazepine
—— 1,1,1-trifluoro-4-(3-fluorophenyl)-4-methyl-2-[phenyl(5H-pyrrolo[3,2-d]pyrimidin-6-yl)methyl]pentan-2-ol —— C25H23F4N3O
1,1,1-trifluoro-4-(3-fluorophenyl)-4-methyl-2-[phenyl(5H-pyrrolo[3,2-d]pyrimidin-6-yl)methyl]pentan-2-ol
—— 5-[(7,8-dihydroxy-2-thiophen-2-yl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl)oxy]-2,2-dihydroxy-9-(4-hydroxy-3,5-dimethoxyphenyl)-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[6,5-f][1,3]benzodioxol-8-one —— C32H32O15S
5-[(7,8-dihydroxy-2-thiophen-2-yl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl)oxy]-2,2-dihydroxy-9-(4-hydroxy-3,5-dimethoxyphenyl)-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[6,5-f][1,3]benzodioxol-8-one
—— 2-[4-[5-[4-[1-(3,4-Dimethoxyphenyl)-1-hydroxypropan-2-yl]oxy-3-methoxyphenyl]-3,4-dimethylpyrrolidin-2-yl]-2-methoxyphenoxy]-1-(4-methoxy-3-methylphenyl)propan-1-ol —— C42H53NO9
2-[4-[5-[4-[1-(3,4-Dimethoxyphenyl)-1-hydroxypropan-2-yl]oxy-3-methoxyphenyl]-3,4-dimethylpyrrolidin-2-yl]-2-methoxyphenoxy]-1-(4-methoxy-3-methylphenyl)propan-1-ol
—— 2-(4-Methylphenyl)-9-phenanthren-2-yl-10-phenanthren-9-ylanthracene —— C49H32
2-(4-Methylphenyl)-9-phenanthren-2-yl-10-phenanthren-9-ylanthracene
—— [3-(2,3,5-Trimethylcyclopenta-1,3-dien-1-yl)-1-(2,3,4-trimethylphenyl)naphthalen-2-yl]methanimine —— C28H29N
[3-(2,3,5-Trimethylcyclopenta-1,3-dien-1-yl)-1-(2,3,4-trimethylphenyl)naphthalen-2-yl]methanimine
—— 2,2-dihydroxy-9-(4-hydroxy-3,5-dimethoxyphenyl)-5-[(4,4,7,8-tetrahydroxy-2-methyl-6,7,8,8a-tetrahydro-4aH-pyrano[3,2-d][1,3]dioxin-6-yl)oxy]-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[6,5-f][1,3]benzodioxol-8-one —— C29H32O17
2,2-dihydroxy-9-(4-hydroxy-3,5-dimethoxyphenyl)-5-[(4,4,7,8-tetrahydroxy-2-methyl-6,7,8,8a-tetrahydro-4aH-pyrano[3,2-d][1,3]dioxin-6-yl)oxy]-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[6,5-f][1,3]benzodioxol-8-one
—— 9-(3,4,4a,5-Tetrahydronaphthalen-2-yl)-10-(6,7-dihydronaphthalen-1-yl)anthracene —— C34H28
9-(3,4,4a,5-Tetrahydronaphthalen-2-yl)-10-(6,7-dihydronaphthalen-1-yl)anthracene
—— Methyl 2-(2-methoxybenzenecarboximidoyl)-4-phenylbutanoate —— C19H21NO3
Methyl 2-(2-methoxybenzenecarboximidoyl)-4-phenylbutanoate
—— 3-Imino-4-naphthalen-1-yl-2-(naphthalen-1-ylmethylidene)butan-1-amine —— C25H22N2
3-Imino-4-naphthalen-1-yl-2-(naphthalen-1-ylmethylidene)butan-1-amine
—— 4-[2-[4-[4-[2-Fluoro-4-(3-piperidin-1-ylphenyl)but-2-enyl]phenyl]phenoxy]ethyl]morpholine —— C33H39FN2O2
4-[2-[4-[4-[2-Fluoro-4-(3-piperidin-1-ylphenyl)but-2-enyl]phenyl]phenoxy]ethyl]morpholine
—— 3,21-Bis(3,5-diphenylphenyl)-8,9,24,25-tetrafluoro-14,28-bis(3-phenylphenyl)nonacyclo[17.13.2.02,15.04,13.06,11.016,33.020,29.022,27.030,34]tetratriaconta-1(32),2,4(13),5,7,9,11,14,16,18,20,22,24,26,28,30-hexadecaene —— C94H56F4
3,21-Bis(3,5-diphenylphenyl)-8,9,24,25-tetrafluoro-14,28-bis(3-phenylphenyl)nonacyclo[17.13.2.02,15.04,13.06,11.016,33.020,29.022,27.030,34]tetratriaconta-1(32),2,4(13),5,7,9,11,14,16,18,20,22,24,26,28,30-hexadecaene
—— 2,6,6-Trimethyl-7-(3-methylphenyl)-4-phenyloctane-2,5-diol —— C24H34O2
2,6,6-Trimethyl-7-(3-methylphenyl)-4-phenyloctane-2,5-diol
—— 2-(3,6-Dihydroxyanthracen-9-yl)-5-(hydrazinecarbonyl)benzoic acid —— C22H16N2O5
2-(3,6-Dihydroxyanthracen-9-yl)-5-(hydrazinecarbonyl)benzoic acid
—— 9-(2-Bicyclo[2.1.0]penta-2,4-dienyl)-2,3,6,7-tetramethyl-10-phenylanthracene —— C29H24
9-(2-Bicyclo[2.1.0]penta-2,4-dienyl)-2,3,6,7-tetramethyl-10-phenylanthracene
—— 4-(4-Fluorophenyl)-3-hydroxy-1-(4-methoxyphenyl)butan-2-one —— C17H17FO3
4-(4-Fluorophenyl)-3-hydroxy-1-(4-methoxyphenyl)butan-2-one
—— (3S,4S,6R)-6-[(1R)-1-(4-fluorophenyl)-2-[(2R,3R)-2-[2-hydroxy-4-[4-[(3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]phenyl]phenyl]-4-oxo-1-phenylazetidin-3-yl]oxyethoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid —— C41H42FNO15
(3S,4S,6R)-6-[(1R)-1-(4-fluorophenyl)-2-[(2R,3R)-2-[2-hydroxy-4-[4-[(3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]phenyl]phenyl]-4-oxo-1-phenylazetidin-3-yl]oxyethoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
—— 12-(3,6-Dimethyl-10-phenylanthracen-9-yl)-9,9,17,17-tetramethylhexacyclo[11.11.0.02,10.03,8.016,24.018,23]tetracosa-1(13),2(10),3,5,7,11,14,16(24),18,20,22-undecaene —— C50H40
12-(3,6-Dimethyl-10-phenylanthracen-9-yl)-9,9,17,17-tetramethylhexacyclo[11.11.0.02,10.03,8.016,24.018,23]tetracosa-1(13),2(10),3,5,7,11,14,16(24),18,20,22-undecaene
—— N-[5-[(1R)-1-hydroxy-2-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]ethyl]-2-phenylmethoxyphenyl]benzenesulfonamide —— C57H54N2O6S
N-[5-[(1R)-1-hydroxy-2-[[1-phenyl-4,4-bis(4-phenylmethoxyphenyl)butan-2-yl]amino]ethyl]-2-phenylmethoxyphenyl]benzenesulfonamide
—— 8-Bromo-3-[4-[4-(10-bromo-3-phenyl-15-octacyclo[16.10.1.15,9.02,16.04,14.019,24.025,29.013,30]triaconta-1(28),2(16),3,5,7,9,11,13(30),14,17,19,21,23,25(29),26-pentadecaenyl)phenyl]phenyl]-15-phenyloctacyclo[16.10.1.15,9.02,16.04,14.019,24.025,29.013,30]triaconta-1(28),2(16),3,5(30),6,8,10,12,14,17,19,21,23,25(29),26-pentadecaene —— C84H44Br2
8-Bromo-3-[4-[4-(10-bromo-3-phenyl-15-octacyclo[16.10.1.15,9.02,16.04,14.019,24.025,29.013,30]triaconta-1(28),2(16),3,5,7,9,11,13(30),14,17,19,21,23,25(29),26-pentadecaenyl)phenyl]phenyl]-15-phenyloctacyclo[16.10.1.15,9.02,16.04,14.019,24.025,29.013,30]triaconta-1(28),2(16),3,5(30),6,8,10,12,14,17,19,21,23,25(29),26-pentadecaene
—— 9-[7-[7-(9,9-Dihexyl-7-methylfluoren-2-yl)-9,9-dihexylfluoren-2-yl]-9,9-dihexylfluoren-2-yl]-10-methyl-1,2,3,4-tetrahydroanthracene —— C91H114
9-[7-[7-(9,9-Dihexyl-7-methylfluoren-2-yl)-9,9-dihexylfluoren-2-yl]-9,9-dihexylfluoren-2-yl]-10-methyl-1,2,3,4-tetrahydroanthracene
—— 5,8,8-trihydroxy-5-(4-hydroxy-3,5-dimethoxyphenyl)-9-[(4,4,7,8-tetrahydroxy-2-methyl-6,7,8,8a-tetrahydro-4aH-pyrano[3,2-d][1,3]dioxin-6-yl)oxy]-8a,9-dihydro-5aH-[2]benzofuro[5,6-f][1,3]benzodioxol-6-one —— C29H32O18
5,8,8-trihydroxy-5-(4-hydroxy-3,5-dimethoxyphenyl)-9-[(4,4,7,8-tetrahydroxy-2-methyl-6,7,8,8a-tetrahydro-4aH-pyrano[3,2-d][1,3]dioxin-6-yl)oxy]-8a,9-dihydro-5aH-[2]benzofuro[5,6-f][1,3]benzodioxol-6-one
—— 10,10-Dimethyl-14-naphthalen-1-yl-21-phenanthren-9-yl-17-phenyl-10-silapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1,3(11),4,6,8,12,14,16,18,20-decaene —— C52H36Si
10,10-Dimethyl-14-naphthalen-1-yl-21-phenanthren-9-yl-17-phenyl-10-silapentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1,3(11),4,6,8,12,14,16,18,20-decaene
—— 9-[2-carboxy-4,10-dihydroxy-5-[(2R,3R,4S,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyanthracen-9-yl]-4,10-dihydroxy-5-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyanthracene-2-carboxylic acid —— C42H38O20
9-[2-carboxy-4,10-dihydroxy-5-[(2R,3R,4S,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyanthracen-9-yl]-4,10-dihydroxy-5-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyanthracene-2-carboxylic acid