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    中文名称 英文名称 CAS号 化学式 结构式图片
    —— (6,9-Dihydroxy-5a-methyl-3-methylidene-2-oxo-3a,4,5,6,7,8,9a,9b-octahydrobenzo[g][1]benzofuran-9-yl)methyl acetate —— C17H24O6
    (6,9-Dihydroxy-5a-methyl-3-methylidene-2-oxo-3a,4,5,6,7,8,9a,9b-octahydrobenzo[g][1]benzofuran-9-yl)methyl acetate
    —— 6,12-Epoxy-7,12-dihydro-6H-dibenz<b,e>oxocin 131271-09-5 C15H12O2
    6,12-Epoxy-7,12-dihydro-6H-dibenz<b,e>oxocin
    —— 6-[3-(4a-hydroxyoctahydroisoquinolin-2(1H)-yl)-3-oxopropyl]-3,5-dimethyl-7H-furo[3,2-g]chromen-7-one —— C25H29NO5
    6-[3-(4a-hydroxyoctahydroisoquinolin-2(1H)-yl)-3-oxopropyl]-3,5-dimethyl-7H-furo[3,2-g]chromen-7-one
    —— (6-hydroxy-5a-methyl-9-methylidene-2-oxo-3a,4,5,6,7,8,9a,9b-octahydro-3H-benzo[g][1]benzofuran-3-yl)methanesulfonic acid —— C15H22O6S
    (6-hydroxy-5a-methyl-9-methylidene-2-oxo-3a,4,5,6,7,8,9a,9b-octahydro-3H-benzo[g][1]benzofuran-3-yl)methanesulfonic acid
    —— 6,7,14-Trihydroxy-13-[[3,4,5-trihydroxy-6-[(3,4,5,6-tetrahydroxyoxan-2-yl)methoxy]oxan-2-yl]methoxy]-2,9-dioxatetracyclo[6.6.2.04,16.011,15]hexadeca-1(15),4,6,8(16),11,13-hexaene-3,10-dione —— C26H26O18
    6,7,14-Trihydroxy-13-[[3,4,5-trihydroxy-6-[(3,4,5,6-tetrahydroxyoxan-2-yl)methoxy]oxan-2-yl]methoxy]-2,9-dioxatetracyclo[6.6.2.04,16.011,15]hexadeca-1(15),4,6,8(16),11,13-hexaene-3,10-dione
    —— 6-(4-hydroxyphenethyl)-4-(1-isobutyl-2-oxo-1,2-dihydroquinolin-3-yl)-7-methyl-3,4-dihydro-2H-pyrano[3,2-c]pyridine-2,5(6H)-dione —— C30H30N2O5
    6-(4-hydroxyphenethyl)-4-(1-isobutyl-2-oxo-1,2-dihydroquinolin-3-yl)-7-methyl-3,4-dihydro-2H-pyrano[3,2-c]pyridine-2,5(6H)-dione
    —— 6-Acetyl-5-hydroxy-7-methyl-4-[18,22,23-trihydroxy-10-(2-hydroxyethyl)spiro[8,20,27-trioxaheptacyclo[12.11.1.12,6.115,24.011,26.019,24.010,28]octacosa-11,14(26)-diene-4,1'-cyclopentane]-21-yl]oxynaphthalene-2-carboxylic acid —— C45H54O12
    6-Acetyl-5-hydroxy-7-methyl-4-[18,22,23-trihydroxy-10-(2-hydroxyethyl)spiro[8,20,27-trioxaheptacyclo[12.11.1.12,6.115,24.011,26.019,24.010,28]octacosa-11,14(26)-diene-4,1'-cyclopentane]-21-yl]oxynaphthalene-2-carboxylic acid
    —— 6-[5-Acetamido-6-[6-[2-[2-[6-(2-amino-2-carboxyethoxy)-4,5-dihydroxyoxan-3-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-carboxy-4,5-dihydroxyoxan-3-yl]oxy-4-hydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4,5-dihydroxyoxane-2-carboxylic acid —— C48H77N3O39
    6-[5-Acetamido-6-[6-[2-[2-[6-(2-amino-2-carboxyethoxy)-4,5-dihydroxyoxan-3-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-carboxy-4,5-dihydroxyoxan-3-yl]oxy-4-hydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4,5-dihydroxyoxane-2-carboxylic acid
    —— 6-ethyl-2,5-dihydroxy-3-[1-(5-hydroxy-1,7-dimethoxy-1,8-dioxonaphthalen-2-yl)ethylidene]-7-methoxyanthracene-1,4,8-trione —— C27H24O10
    6-ethyl-2,5-dihydroxy-3-[1-(5-hydroxy-1,7-dimethoxy-1,8-dioxonaphthalen-2-yl)ethylidene]-7-methoxyanthracene-1,4,8-trione
    —— [6-[[9-[4-Amino-5-(methoxycarbonylamino)-4,6-dimethyloxan-2-yl]oxy-5,23-dihydroxy-8,12,18,20,22-pentamethyl-25,27-dioxo-3-(3-oxobut-1-enyl)-26-oxapentacyclo[22.2.1.01,6.013,22.016,21]heptacosa-3,7,11,14,23-pentaen-17-yl]oxy]-4-[5-(4,5-dihydroxy-6-methyloxan-2-yl)oxy-4-hydroxy-6-methyloxan-2-yl]oxy-2-methyloxan-3-yl] acetate —— C64H92N2O21
    [6-[[9-[4-Amino-5-(methoxycarbonylamino)-4,6-dimethyloxan-2-yl]oxy-5,23-dihydroxy-8,12,18,20,22-pentamethyl-25,27-dioxo-3-(3-oxobut-1-enyl)-26-oxapentacyclo[22.2.1.01,6.013,22.016,21]heptacosa-3,7,11,14,23-pentaen-17-yl]oxy]-4-[5-(4,5-dihydroxy-6-methyloxan-2-yl)oxy-4-hydroxy-6-methyloxan-2-yl]oxy-2-methyloxan-3-yl] acetate
    —— [6-[[5,7-dihydroxy-2-(4-hydroxy-3-methoxyphenyl)-8aH-chromen-1-ium-3-yl]oxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3-(4-hydroxyphenyl)prop-2-enoate —— C31H31O13+
    [6-[[5,7-dihydroxy-2-(4-hydroxy-3-methoxyphenyl)-8aH-chromen-1-ium-3-yl]oxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3-(4-hydroxyphenyl)prop-2-enoate
    —— 6-(3,4-dimethoxyphenyl)-2,3-dimethyl-7H-furo[3,2-g]chromen-7-one —— C21H18O5
    6-(3,4-dimethoxyphenyl)-2,3-dimethyl-7H-furo[3,2-g]chromen-7-one
    —— 6-[[4-(3-aminophenyl)triazol-1-yl]methyl]-N-(pyridin-3-ylmethyl)-1-azabicyclo[2.2.2]octane-3-carboxamide —— C23H27N7O
    6-[[4-(3-aminophenyl)triazol-1-yl]methyl]-N-(pyridin-3-ylmethyl)-1-azabicyclo[2.2.2]octane-3-carboxamide
    —— 6-ethyl-4-hydroxy-3,5-dimethyl-2-pyrone 42738-93-2 C9H12O3
    6-ethyl-4-hydroxy-3,5-dimethyl-2-pyrone
    —— 6-[(4-chlorophenyl)carbonyl]-5-hydroxy-4-[2-(pyridin-2-ylmethoxy)phenyl]-3,4-dihydro-2H-chromen-2-one —— C28H20ClNO5
    6-[(4-chlorophenyl)carbonyl]-5-hydroxy-4-[2-(pyridin-2-ylmethoxy)phenyl]-3,4-dihydro-2H-chromen-2-one
    —— 6-Hydroxy-5-methoxy-7-(3-methylbut-2-enoxy)chromen-2-one —— C15H16O5
    6-Hydroxy-5-methoxy-7-(3-methylbut-2-enoxy)chromen-2-one
    —— 6-(Diaminomethylideneamino)-5-[9,12-dihydroxy-2,6,6,21,22-pentamethyl-5,24-dioxo-8-(2-phenylethenyl)-15-hexacyclo[18.3.1.02,7.09,23.012,22.014,21]tetracosa-1(23),10-dienyl]-4-hydroxy-2-methyl-3-oxohexanoic acid —— C45H59N3O8
    6-(Diaminomethylideneamino)-5-[9,12-dihydroxy-2,6,6,21,22-pentamethyl-5,24-dioxo-8-(2-phenylethenyl)-15-hexacyclo[18.3.1.02,7.09,23.012,22.014,21]tetracosa-1(23),10-dienyl]-4-hydroxy-2-methyl-3-oxohexanoic acid
    —— (6-Hydroxy-3,6,9-trimethyl-2-oxo-3,3a,4,5,8,9b-hexahydroazuleno[4,5-b]furan-4-yl) 2-methylbut-2-enoate —— C20H26O5
    (6-Hydroxy-3,6,9-trimethyl-2-oxo-3,3a,4,5,8,9b-hexahydroazuleno[4,5-b]furan-4-yl) 2-methylbut-2-enoate
    —— [6-[6-[[4-Butanoyloxy-10-hydroxy-5-methoxy-9,16-dimethyl-2-oxo-7-(2-oxoethyl)-1-oxacyclohexadeca-11,13-dien-6-yl]oxy]-4-(dimethylamino)-5-hydroxy-2-methyloxan-3-yl]oxy-4-hydroxy-2,4-dimethyloxan-3-yl] 3-methylbutanoate —— C44H73NO15
    [6-[6-[[4-Butanoyloxy-10-hydroxy-5-methoxy-9,16-dimethyl-2-oxo-7-(2-oxoethyl)-1-oxacyclohexadeca-11,13-dien-6-yl]oxy]-4-(dimethylamino)-5-hydroxy-2-methyloxan-3-yl]oxy-4-hydroxy-2,4-dimethyloxan-3-yl] 3-methylbutanoate
    —— [6-[2-[5,7-Dihydroxy-2-(4-hydroxyphenyl)-4-oxochromen-6-yl]-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-4,5-dihydroxy-2-methyloxan-3-yl] acetate —— C29H32O15
    [6-[2-[5,7-Dihydroxy-2-(4-hydroxyphenyl)-4-oxochromen-6-yl]-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-4,5-dihydroxy-2-methyloxan-3-yl] acetate
    —— [6-[3,4-Dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl 3-phenylprop-2-enoate —— C21H28O12
    [6-[3,4-Dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl 3-phenylprop-2-enoate
    —— 6-(Furan-3-yl)-9,17-dihydroxy-12-methoxy-1,7,11,15,15-pentamethyl-3-oxapentacyclo[8.8.0.02,4.02,7.011,16]octadec-16-ene-14,18-dione —— C27H34O7
    6-(Furan-3-yl)-9,17-dihydroxy-12-methoxy-1,7,11,15,15-pentamethyl-3-oxapentacyclo[8.8.0.02,4.02,7.011,16]octadec-16-ene-14,18-dione
    —— 6-[4-[2-(3,5-dihydroxy-2-methylidenecyclohexylidene)ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-2,4-dihydroxy-2-methylheptan-3-one —— C27H42O5
    6-[4-[2-(3,5-dihydroxy-2-methylidenecyclohexylidene)ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-2,4-dihydroxy-2-methylheptan-3-one
    —— 6-hydroxy-1,1,4a-trimethyl-5,8-dioxo-7-(propan-2-yl)-1,2,3,4,4a,5,8,9,10,10a-decahydrophenanthren-2-yl acetate —— C22H30O5
    6-hydroxy-1,1,4a-trimethyl-5,8-dioxo-7-(propan-2-yl)-1,2,3,4,4a,5,8,9,10,10a-decahydrophenanthren-2-yl acetate
    —— 6,6,8-trimethyl-N-propan-2-yl-1,3,4,7,9,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide —— C14H28N4O
    6,6,8-trimethyl-N-propan-2-yl-1,3,4,7,9,9a-hexahydropyrazino[1,2-a]pyrazine-2-carboxamide
    —— 6,14-Dimethyl-7-(3-methylbutyl)-8-oxapentacyclo[11.8.0.02,10.05,10.014,19]henicosa-6,19-dien-17-ol —— C27H42O2
    6,14-Dimethyl-7-(3-methylbutyl)-8-oxapentacyclo[11.8.0.02,10.05,10.014,19]henicosa-6,19-dien-17-ol
    —— 6-Amino-7,7,12,16-tetramethyl-15-[1-(methylamino)ethyl]pentacyclo[9.7.0.01,3.03,8.012,16]octadecan-14-ol —— C25H44N2O
    6-Amino-7,7,12,16-tetramethyl-15-[1-(methylamino)ethyl]pentacyclo[9.7.0.01,3.03,8.012,16]octadecan-14-ol
    —— 6,7-dibromo-3-[5-(6-bromo-1H-indol-3-yl)-4-methylpiperazin-2-yl]-1H-indol-4-ol —— C21H19Br3N4O
    6,7-dibromo-3-[5-(6-bromo-1H-indol-3-yl)-4-methylpiperazin-2-yl]-1H-indol-4-ol
    —— 6-hydroxy-2,4-dimethoxy-3-methyl-benzaldehyde 61110-15-4 C10H12O4
    6-hydroxy-2,4-dimethoxy-3-methyl-benzaldehyde
    —— 6-Acetyl-7,9-dihydroxy-2-[1-[[3-methoxy-4-(2-methylpropoxy)phenyl]methylamino]ethylidene]-8,9b-dimethyldibenzofuran-1,3-dione —— C30H33NO8
    6-Acetyl-7,9-dihydroxy-2-[1-[[3-methoxy-4-(2-methylpropoxy)phenyl]methylamino]ethylidene]-8,9b-dimethyldibenzofuran-1,3-dione
    —— 6-(3-hydroxy-4,4,8,10,14-pentamethyl-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2-methylhept-6-ene-2,3-diol —— C30H52O3
    6-(3-hydroxy-4,4,8,10,14-pentamethyl-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2-methylhept-6-ene-2,3-diol
    —— [6-[1-[2-[3-(15,19-Dihydroxy-5,14,14-trimethyl-12-sulfooxy-16-oxapentacyclo[13.2.2.01,13.02,10.05,9]nonadec-2(10)-en-6-yl)butyl]-1,7-dimethyl-3-oxabicyclo[4.2.1]non-7-en-4-yl]ethyl]-15,19-dihydroxy-5,14,14-trimethyl-16-oxapentacyclo[13.2.2.01,13.02,10.05,9]nonadec-2(10)-en-12-yl] hydrogen sulfate —— C58H88O15S2
    [6-[1-[2-[3-(15,19-Dihydroxy-5,14,14-trimethyl-12-sulfooxy-16-oxapentacyclo[13.2.2.01,13.02,10.05,9]nonadec-2(10)-en-6-yl)butyl]-1,7-dimethyl-3-oxabicyclo[4.2.1]non-7-en-4-yl]ethyl]-15,19-dihydroxy-5,14,14-trimethyl-16-oxapentacyclo[13.2.2.01,13.02,10.05,9]nonadec-2(10)-en-12-yl] hydrogen sulfate
    —— 6H-pyrrolo[3,4-c]pyridazin-7-ol —— C6H5N3O
    6H-pyrrolo[3,4-c]pyridazin-7-ol
    —— 6-bromo-5-hydroxy-1,2-dimethyl-indole-3-carboxylic acid ethyl ester 40945-68-4 C13H14BrNO3
    6-bromo-5-hydroxy-1,2-dimethyl-indole-3-carboxylic acid ethyl ester
    —— [6-[5-(4,5-Dihydroxy-4,6-dimethyloxan-2-yl)oxy-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-10-[5-(dimethylamino)-6-methyloxan-2-yl]oxy-16-ethyl-7-formyl-5,9,13,15-tetramethyl-2-oxo-1-oxacyclohexadeca-11,13-dien-4-yl] acetate —— C47H80N2O14
    [6-[5-(4,5-Dihydroxy-4,6-dimethyloxan-2-yl)oxy-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-10-[5-(dimethylamino)-6-methyloxan-2-yl]oxy-16-ethyl-7-formyl-5,9,13,15-tetramethyl-2-oxo-1-oxacyclohexadeca-11,13-dien-4-yl] acetate
    —— 6-O-methylmangostanin —— C25H28O7
    6-O-methylmangostanin
    —— 6,16-Dihydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one —— C19H28O3
    6,16-Dihydroxy-10,13-dimethyl-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one
    —— 6-(4,4,6b,10,11b-pentamethyl-3-oxo-2,4a,5,6,6a,7,8,10a-octahydro-1H-benzo[a]fluoren-9-yl)-2-methylhept-2-enoic acid —— C30H44O3
    6-(4,4,6b,10,11b-pentamethyl-3-oxo-2,4a,5,6,6a,7,8,10a-octahydro-1H-benzo[a]fluoren-9-yl)-2-methylhept-2-enoic acid
    —— 6-Hydroxy-9-methyl-20-(methylaminomethyl)-16-methylimino-15,17-diazapentacyclo[15.3.1.01,8.02,11.04,8]henicosa-4,18-dien-12-yne-5-carboxylic acid —— C24H32N4O3
    6-Hydroxy-9-methyl-20-(methylaminomethyl)-16-methylimino-15,17-diazapentacyclo[15.3.1.01,8.02,11.04,8]henicosa-4,18-dien-12-yne-5-carboxylic acid
    —— (6-acetyloxy-5-hydroxy-6,10,14-trimethyl-3-methylidene-2-oxo-4,5,7,8,11,12,15,15a-octahydro-3aH-cyclotetradeca[b]furan-15-yl) acetate —— C24H34O7
    (6-acetyloxy-5-hydroxy-6,10,14-trimethyl-3-methylidene-2-oxo-4,5,7,8,11,12,15,15a-octahydro-3aH-cyclotetradeca[b]furan-15-yl) acetate
    —— 6-Hydroxy-7,8-dimethoxy-1,2,3,4-tetrahydroisochinolin 5308-58-7 C11H15NO3
    6-Hydroxy-7,8-dimethoxy-1,2,3,4-tetrahydroisochinolin
    —— 6-[[4-[(dimethylamino)methyl]triazol-1-yl]methyl]-N-(2-methoxyethyl)-1-azabicyclo[2.2.2]octane-3-carboxamide —— C17H30N6O2
    6-[[4-[(dimethylamino)methyl]triazol-1-yl]methyl]-N-(2-methoxyethyl)-1-azabicyclo[2.2.2]octane-3-carboxamide
    —— 6-Acetyl-5-hydroxy-7-methyl-4-[(10,14,15-trihydroxy-2,12-dioxatetracyclo[7.6.2.01,11.05,10]heptadec-3-en-13-yl)oxy]naphthalene-2-carboxylic acid —— C29H32O10
    6-Acetyl-5-hydroxy-7-methyl-4-[(10,14,15-trihydroxy-2,12-dioxatetracyclo[7.6.2.01,11.05,10]heptadec-3-en-13-yl)oxy]naphthalene-2-carboxylic acid
    —— 6,13-Dihydroxy-2-(3-hydroxyhex-4-enoyl)-4,7,11,14-tetramethyl-16-penta-1,3-dienyl-5,12,15-trioxahexacyclo[7.5.2.03,7.04,13.06,11.010,14]hexadeca-1,9(16)-dien-8-one —— C28H32O8
    6,13-Dihydroxy-2-(3-hydroxyhex-4-enoyl)-4,7,11,14-tetramethyl-16-penta-1,3-dienyl-5,12,15-trioxahexacyclo[7.5.2.03,7.04,13.06,11.010,14]hexadeca-1,9(16)-dien-8-one
    —— 6-Acetyl-2-hydroxy-naphthazarin 13379-24-3 C12H8O6
    6-Acetyl-2-hydroxy-naphthazarin
    —— [6-[5,6-Dihydroxy-6-methyl-3-(2-methylbut-2-enoyloxy)hept-1-en-2-yl]-3,5-dihydroxy-3-methyl-4-(2-methylbut-2-enoyloxy)-2-oxocyclohexyl] 2-methylbut-2-enoate —— C30H44O11
    [6-[5,6-Dihydroxy-6-methyl-3-(2-methylbut-2-enoyloxy)hept-1-en-2-yl]-3,5-dihydroxy-3-methyl-4-(2-methylbut-2-enoyloxy)-2-oxocyclohexyl] 2-methylbut-2-enoate
    —— [6-[2-(3,4-Dihydroxyphenyl)-3,5-dihydroxy-4-oxochromen-7-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl 3-(3,4-dihydroxyphenyl)prop-2-enoate —— C30H26O15
    [6-[2-(3,4-Dihydroxyphenyl)-3,5-dihydroxy-4-oxochromen-7-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl 3-(3,4-dihydroxyphenyl)prop-2-enoate
    —— 6-(4-Hydroxy-3,5-dimethoxyphenyl)-3-(4-hydroxy-3-methoxyphenyl)-1,3,4,6-tetrahydrofuro[3,4-c]furan-3a,6a-diol —— C21H24O9
    6-(4-Hydroxy-3,5-dimethoxyphenyl)-3-(4-hydroxy-3-methoxyphenyl)-1,3,4,6-tetrahydrofuro[3,4-c]furan-3a,6a-diol
    —— [6-[2-[4-(10,12-Dihydroxy-3,17-dimethoxy-7,9,11,13,15-pentamethyl-18-oxo-1-oxacyclooctadeca-4,6,14,16-tetraen-2-yl)-3-hydroxypentan-2-yl]-2-hydroxy-5-methyl-6-prop-1-enyloxan-4-yl]oxy-4-hydroxy-2-methyloxan-3-yl] carbamate —— C45H73NO14
    [6-[2-[4-(10,12-Dihydroxy-3,17-dimethoxy-7,9,11,13,15-pentamethyl-18-oxo-1-oxacyclooctadeca-4,6,14,16-tetraen-2-yl)-3-hydroxypentan-2-yl]-2-hydroxy-5-methyl-6-prop-1-enyloxan-4-yl]oxy-4-hydroxy-2-methyloxan-3-yl] carbamate
    —— 6'-But-2-en-2-yl-9-hydroxy-5',6,14,16-tetramethyl-3,7-dioxospiro[2,20-dioxatricyclo[17.3.1.04,9]tricosa-5,10,12,16-tetraene-21,2'-oxane]-10-carbaldehyde —— C34H46O7
    6'-But-2-en-2-yl-9-hydroxy-5',6,14,16-tetramethyl-3,7-dioxospiro[2,20-dioxatricyclo[17.3.1.04,9]tricosa-5,10,12,16-tetraene-21,2'-oxane]-10-carbaldehyde