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中文名称 英文名称 CAS号 化学式 结构式图片
—— 8-(2,4-difluorophenyl)-N-(4-methoxyphenyl)-4-methyl-5-oxo-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepine-2-carboxamide —— C26H23F2N3O4
8-(2,4-difluorophenyl)-N-(4-methoxyphenyl)-4-methyl-5-oxo-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepine-2-carboxamide
—— [8-cyclohexyl-4-hydroxy-3,4a,8-trimethyl-4-[2-(5-oxo-2H-furan-3-yl)ethyl]-2,3,5,6,7,8a-hexahydro-1H-naphthalen-1-yl] acetate —— C27H42O5
[8-cyclohexyl-4-hydroxy-3,4a,8-trimethyl-4-[2-(5-oxo-2H-furan-3-yl)ethyl]-2,3,5,6,7,8a-hexahydro-1H-naphthalen-1-yl] acetate
—— 8-(azepanium-1-ylmethyl)-3-(2,4-dimethoxyphenyl)-4-methyl-2-oxo-2H-chromen-7-olate —— C25H29NO5
8-(azepanium-1-ylmethyl)-3-(2,4-dimethoxyphenyl)-4-methyl-2-oxo-2H-chromen-7-olate
—— 8-[6-[3-(2-Aminoethyl)cyclopent-2-en-1-yl]hexyl]-9-(4-hydroxyphenyl)bicyclo[9.3.1]pentadeca-1(15),5,11,13-tetraene-3-carboxylic acid —— C35H47NO3
8-[6-[3-(2-Aminoethyl)cyclopent-2-en-1-yl]hexyl]-9-(4-hydroxyphenyl)bicyclo[9.3.1]pentadeca-1(15),5,11,13-tetraene-3-carboxylic acid
—— [8-(3a,4,5,6a-tetrahydrofuro[2,3-b]furan-5-yl)-5-acetyloxy-4a-(acetyloxymethyl)-3-hydroxy-7,8-dimethylspiro[2,3,5,6,7,8a-hexahydro-1H-naphthalene-4,2'-oxirane]-1-yl] 2-methylbut-2-enoate —— C29H40O10
[8-(3a,4,5,6a-tetrahydrofuro[2,3-b]furan-5-yl)-5-acetyloxy-4a-(acetyloxymethyl)-3-hydroxy-7,8-dimethylspiro[2,3,5,6,7,8a-hexahydro-1H-naphthalene-4,2'-oxirane]-1-yl] 2-methylbut-2-enoate
—— 8a-[4,5-Dihydroxy-3-[3-hydroxy-6-methyl-4,5-bis[(3,4,5-trihydroxyoxan-2-yl)oxy]oxan-2-yl]oxyoxan-2-yl]oxycarbonyl-3-[3,5-dihydroxy-6-(hydroxymethyl)-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2-hydroxy-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid —— C63H100O32
8a-[4,5-Dihydroxy-3-[3-hydroxy-6-methyl-4,5-bis[(3,4,5-trihydroxyoxan-2-yl)oxy]oxan-2-yl]oxyoxan-2-yl]oxycarbonyl-3-[3,5-dihydroxy-6-(hydroxymethyl)-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-2-hydroxy-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carboxylic acid
—— 8-(3-chlorophenyl)-N-methyl-2-[3-(trifluoromethyl)phenyl]pyrazolo[1,5-a][1,3,5]triazin-4-amine —— C19H13ClF3N5
8-(3-chlorophenyl)-N-methyl-2-[3-(trifluoromethyl)phenyl]pyrazolo[1,5-a][1,3,5]triazin-4-amine
—— 8,15-Dihydroxy-3,16,17-trimethoxytricyclo[12.3.1.12,6]nonadeca-1(17),2,4,6(19),14(18),15-hexaen-9-one 56222-03-8 C22H26O6
8,15-Dihydroxy-3,16,17-trimethoxytricyclo[12.3.1.12,6]nonadeca-1(17),2,4,6(19),14(18),15-hexaen-9-one
—— 8-[[3-Hydroxy-16-[(2-hydroxy-4-methylpentanoyl)amino]-4,9-dimethylhexadeca-4,6,8,10,12-pentaenoyl]amino]-2-methylnona-3,5,7-trienoic acid —— C34H50N2O6
8-[[3-Hydroxy-16-[(2-hydroxy-4-methylpentanoyl)amino]-4,9-dimethylhexadeca-4,6,8,10,12-pentaenoyl]amino]-2-methylnona-3,5,7-trienoic acid
—— 8a-[4-[3,4-Dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-[3,4-dihydroxy-6-methyl-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxy-5-hydroxy-6-methyloxan-2-yl]oxycarbonyl-2-hydroxy-6b-(hydroxymethyl)-4,6a,11,11,14b-pentamethyl-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 —— C58H92O28
8a-[4-[3,4-Dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-[3,4-dihydroxy-6-methyl-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxy-5-hydroxy-6-methyloxan-2-yl]oxycarbonyl-2-hydroxy-6b-(hydroxymethyl)-4,6a,11,11,14b-pentamethyl-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-methoxy-9H-pyrido[3,4-b]indole-1,3,4-trione —— C12H8N2O4
8-methoxy-9H-pyrido[3,4-b]indole-1,3,4-trione
—— 8-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxy-4-(1-hydroxypropyl)-6-(3-methylbutanoyl)chromen-2-one —— C27H36O6
8-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxy-4-(1-hydroxypropyl)-6-(3-methylbutanoyl)chromen-2-one
—— [8-[[4-[2-(6-amino-1,2-dihydropyridin-4-yl)-2-(3-hydroxyphenyl)ethyl]-1H-pyrrol-3-yl]methyl]-1-(4-hydroxy-3-methoxyphenyl)-3-oxodecan-5-yl] acetate —— C37H47N3O6
[8-[[4-[2-(6-amino-1,2-dihydropyridin-4-yl)-2-(3-hydroxyphenyl)ethyl]-1H-pyrrol-3-yl]methyl]-1-(4-hydroxy-3-methoxyphenyl)-3-oxodecan-5-yl] acetate
—— 8-acetyl-3,6-dimethyl-3a,4,5,6,6a,7-hexahydro-3H-cyclopenta[h][1]benzofuran-2-one —— C15H20O3
8-acetyl-3,6-dimethyl-3a,4,5,6,6a,7-hexahydro-3H-cyclopenta[h][1]benzofuran-2-one
—— 8,13,13,17-Tetramethyl-21-oxa-12-azahexacyclo[10.7.1.12,17.05,20.06,11.014,19]henicosa-1,3,5(20),6(11),7,9-hexaen-9-ol —— C23H25NO2
8,13,13,17-Tetramethyl-21-oxa-12-azahexacyclo[10.7.1.12,17.05,20.06,11.014,19]henicosa-1,3,5(20),6(11),7,9-hexaen-9-ol
—— 8-[(2-fluorobenzyl)sulfanyl]-9-methyl-1,9-dihydro-6H-purin-6-one —— C13H11FN4OS
8-[(2-fluorobenzyl)sulfanyl]-9-methyl-1,9-dihydro-6H-purin-6-one
—— 8a-methyl-5-methylidene-3-[(2-phenylethylamino)methyl]-3a,4,4a,6,7,8,9,9a-octahydro-3H-benzo[f][1]benzofuran-2-one —— C23H31NO2
8a-methyl-5-methylidene-3-[(2-phenylethylamino)methyl]-3a,4,4a,6,7,8,9,9a-octahydro-3H-benzo[f][1]benzofuran-2-one
—— 8-[3-hydroxy-5-(1H-indole-3-carbonyloxy)-6-methyloxan-2-yl]oxynonanoic acid —— C24H33NO7
8-[3-hydroxy-5-(1H-indole-3-carbonyloxy)-6-methyloxan-2-yl]oxynonanoic acid
—— (8-Methyl-8-azabicyclo[3.2.1]oct-6-en-3-yl) 2-phenylprop-2-enoate —— C17H19NO2
(8-Methyl-8-azabicyclo[3.2.1]oct-6-en-3-yl) 2-phenylprop-2-enoate
—— 8,16-Bis(4-hydroxyphenyl)-9-[[4,6,12-trihydroxy-8,16-bis(4-hydroxyphenyl)-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaen-9-yl]oxy]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaene-4,6,12-triol —— C56H42O13
8,16-Bis(4-hydroxyphenyl)-9-[[4,6,12-trihydroxy-8,16-bis(4-hydroxyphenyl)-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaen-9-yl]oxy]-15-oxatetracyclo[8.6.1.02,7.014,17]heptadeca-2(7),3,5,10(17),11,13-hexaene-4,6,12-triol
—— 8-(4-Hydroxy-2,6,6-trimethylcyclohex-2-en-1-yl)-6-methylocta-3,5,7-trien-2-one —— C18H26O2
8-(4-Hydroxy-2,6,6-trimethylcyclohex-2-en-1-yl)-6-methylocta-3,5,7-trien-2-one
—— 8-Hydroxy-4,6a,6b,8a,11,14b-hexamethyl-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-11-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carbaldehyde —— C42H68O14
8-Hydroxy-4,6a,6b,8a,11,14b-hexamethyl-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-11-[[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicene-4-carbaldehyde
—— 8-[2-[[3-[2-(3-Aminophenyl)cyclopentyl]-3-methyloxiran-2-yl]-hydroxymethyl]-1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-1-yl]-18-hydroxy-1-[3-hydroxy-5-(methylaminomethyl)phenyl]-13,18,23,25-tetramethyl-16-azahexacyclo[21.3.1.05,9.05,13.012,25.015,24]heptacos-8-ene-7,27-dione —— C63H89N3O6
8-[2-[[3-[2-(3-Aminophenyl)cyclopentyl]-3-methyloxiran-2-yl]-hydroxymethyl]-1,2,3,4,4a,5,6,7,8,8a-decahydronaphthalen-1-yl]-18-hydroxy-1-[3-hydroxy-5-(methylaminomethyl)phenyl]-13,18,23,25-tetramethyl-16-azahexacyclo[21.3.1.05,9.05,13.012,25.015,24]heptacos-8-ene-7,27-dione
—— 8-(cyclopropanecarbonylamino)-N-[(3,5-difluorophenyl)methyl]-1-methyl-2-oxoazonane-4-carboxamide —— C21H27F2N3O3
8-(cyclopropanecarbonylamino)-N-[(3,5-difluorophenyl)methyl]-1-methyl-2-oxoazonane-4-carboxamide
—— 8-(3,4-Dihydroxybenzoyl)-4-(2-hydroxypropan-2-yl)-9,9-dimethyl-1-(3-methylbut-2-enyl)-10-(5-methyl-2-prop-1-en-2-ylhex-5-enyl)-3-oxatricyclo[6.3.1.02,6]dodec-2(6)-ene-7,12-dione —— C38H50O7
8-(3,4-Dihydroxybenzoyl)-4-(2-hydroxypropan-2-yl)-9,9-dimethyl-1-(3-methylbut-2-enyl)-10-(5-methyl-2-prop-1-en-2-ylhex-5-enyl)-3-oxatricyclo[6.3.1.02,6]dodec-2(6)-ene-7,12-dione
—— 8a-[4,5-Diacetyloxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxycarbonyl-2,3-dihydroxy-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 —— C46H70O17
8a-[4,5-Diacetyloxy-6-methyl-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxycarbonyl-2,3-dihydroxy-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
—— 8-acetyl-4,9-dimethyl-2H-furo[2,3-h]chromen-2-one ketoxime —— C15H13NO4
8-acetyl-4,9-dimethyl-2H-furo[2,3-h]chromen-2-one ketoxime
—— 8-(hydroxymethyl)-4,4,6a,6b,11,11,14b-heptamethyl-2,3,4a,5,6,7,8,8a,9,10,12,12a,14,14a-tetradecahydro-1H-picene-3,9-diol —— C30H50O3
8-(hydroxymethyl)-4,4,6a,6b,11,11,14b-heptamethyl-2,3,4a,5,6,7,8,8a,9,10,12,12a,14,14a-tetradecahydro-1H-picene-3,9-diol
—— 8a-methyl-4-methylidene-6-propan-2-yl-3,4a,5,6,7,8-hexahydro-2H-naphthalen-1-one —— C15H24O
8a-methyl-4-methylidene-6-propan-2-yl-3,4a,5,6,7,8-hexahydro-2H-naphthalen-1-one
—— (8a-Methyl-4-methylidene-6-prop-1-en-2-yl-1,2,3,4a,5,6,7,8-octahydronaphthalen-1-yl) acetate —— C17H26O2
(8a-Methyl-4-methylidene-6-prop-1-en-2-yl-1,2,3,4a,5,6,7,8-octahydronaphthalen-1-yl) acetate
—— 8-(2,2-Dimethylcyclopropyl)-5-methyloct-5-en-2-one —— C14H24O
8-(2,2-Dimethylcyclopropyl)-5-methyloct-5-en-2-one
—— 8-bromo-4,7-dimethoxy-7,8-dimethyl-5H-pyrano[4,3-b]pyran-2-one —— C12H15BrO5
8-bromo-4,7-dimethoxy-7,8-dimethyl-5H-pyrano[4,3-b]pyran-2-one
—— (8-ethyl-3-hydroxy-3,5b,8,11a,13a-pentamethyl-1,4-dioxo-7,7a,9,10,11,11b,12,13-octahydro-6H-phenanthro[2,1-e][2]benzofuran-13-yl) 3-hydroxypentanoate —— C32H46O7
(8-ethyl-3-hydroxy-3,5b,8,11a,13a-pentamethyl-1,4-dioxo-7,7a,9,10,11,11b,12,13-octahydro-6H-phenanthro[2,1-e][2]benzofuran-13-yl) 3-hydroxypentanoate
—— 8-({[2-(3-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methyl}sulfanyl)-9-methyl-1,9-dihydro-6H-purin-6-one —— C17H14ClN5O2S
8-({[2-(3-chlorophenyl)-5-methyl-1,3-oxazol-4-yl]methyl}sulfanyl)-9-methyl-1,9-dihydro-6H-purin-6-one
—— 8-fluoro-4-methyl-5-oxo-N-prop-2-enyl-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepine-2-carboxamide —— C16H18FN3O3
8-fluoro-4-methyl-5-oxo-N-prop-2-enyl-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepine-2-carboxamide
—— [8-(Diaminomethylideneamino)-18,26-dihydroxy-25-methoxy-28-(3-methylbutyl)-4-oxo-10,11-dithia-3-azatricyclo[21.3.1.13,6]octacosa-1(26),23(27),24-trien-20-yl] acetate —— C34H56N4O6S2
[8-(Diaminomethylideneamino)-18,26-dihydroxy-25-methoxy-28-(3-methylbutyl)-4-oxo-10,11-dithia-3-azatricyclo[21.3.1.13,6]octacosa-1(26),23(27),24-trien-20-yl] acetate
—— (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-hydroxypentanoate —— C32H48O6
(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-hydroxypentanoate
—— [8-acetyloxy-5,6-dimethyl-5-[2-(5-oxo-2H-furan-3-yl)ethyl]spiro[1,3,4,4a,6,7,8,8a-octahydronaphthalene-2,2'-oxirane]-1-yl]methyl acetate —— C24H34O7
[8-acetyloxy-5,6-dimethyl-5-[2-(5-oxo-2H-furan-3-yl)ethyl]spiro[1,3,4,4a,6,7,8,8a-octahydronaphthalene-2,2'-oxirane]-1-yl]methyl acetate
—— (8-Acetyl-1-ethyl-9-hydroxy-1,4a,6a,10b-tetramethyl-2,3,4,4b,5,6,9,10,10a,11,12,12a-dodecahydrochrysen-6-yl) 3-acetyloxybutanoate —— C32H50O6
(8-Acetyl-1-ethyl-9-hydroxy-1,4a,6a,10b-tetramethyl-2,3,4,4b,5,6,9,10,10a,11,12,12a-dodecahydrochrysen-6-yl) 3-acetyloxybutanoate
—— (8,15-Dihydroxy-13-methoxy-1-methyl-12,17-dioxo-14-oxapentacyclo[11.6.1.02,11.04,9.016,20]icosa-2,4,6,8,10,16(20)-hexaen-5-yl) hydrogen sulfate —— C21H18O10S
(8,15-Dihydroxy-13-methoxy-1-methyl-12,17-dioxo-14-oxapentacyclo[11.6.1.02,11.04,9.016,20]icosa-2,4,6,8,10,16(20)-hexaen-5-yl) hydrogen sulfate
—— 8-Chloro-5,6,7-trihydroxy-2-(3-hydroxy-4-methoxyphenethyl)-5,6,7,8-tetrahydro-4h-chromen-4-one —— C18H19ClO7
8-Chloro-5,6,7-trihydroxy-2-(3-hydroxy-4-methoxyphenethyl)-5,6,7,8-tetrahydro-4h-chromen-4-one
—— 8-(4-Ethyl-1,3,17-triazatetracyclo[14.3.1.17,11.02,6]henicosa-2(6),4,7,9,11(21)-pentaen-14-yn-13-yl)-5-hydroxy-2-(4-hydroxyphenyl)-6-methoxy-7-(2-phenylethoxy)chromen-4-one —— C44H41N3O6
8-(4-Ethyl-1,3,17-triazatetracyclo[14.3.1.17,11.02,6]henicosa-2(6),4,7,9,11(21)-pentaen-14-yn-13-yl)-5-hydroxy-2-(4-hydroxyphenyl)-6-methoxy-7-(2-phenylethoxy)chromen-4-one
—— 8-[3-(5,7-Dihydroxy-4-oxochromen-2-yl)-5-hydroxyphenyl]-2-(3,4-dihydroxyphenyl)-5,7-dihydroxychromen-4-one —— C30H18O11
8-[3-(5,7-Dihydroxy-4-oxochromen-2-yl)-5-hydroxyphenyl]-2-(3,4-dihydroxyphenyl)-5,7-dihydroxychromen-4-one
—— 8-[(3-Methoxyphenyl)methylamino]-1-methyl-4-(4-methylpiperazine-1-carbonyl)azonan-2-one —— C23H36N4O3
8-[(3-Methoxyphenyl)methylamino]-1-methyl-4-(4-methylpiperazine-1-carbonyl)azonan-2-one
—— 8-Carboxymethyl-1,3,5,6-tetrahydroxyxanthone —— C16H12O8
8-Carboxymethyl-1,3,5,6-tetrahydroxyxanthone
—— 8-hydroxy-3,3,7,9-tetramethyl-8-[2-(5-oxo-2H-furan-3-yl)ethyl]-15-oxatricyclo[7.6.1.02,7]hexadec-10-yn-14-one —— C25H34O5
8-hydroxy-3,3,7,9-tetramethyl-8-[2-(5-oxo-2H-furan-3-yl)ethyl]-15-oxatricyclo[7.6.1.02,7]hexadec-10-yn-14-one
—— 8a-[3-[4-[3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-2-oxo-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,4a,5,6,7,8,9,10,12,12a,14,14a-dodecahydro-1H-picene-4-carboxylic acid —— C58H90O28
8a-[3-[4-[3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxycarbonyl-4,6a,6b,11,11,14b-hexamethyl-2-oxo-3-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,4a,5,6,7,8,9,10,12,12a,14,14a-dodecahydro-1H-picene-4-carboxylic acid
—— 8-bromospiro[3,4-dihydro-2H-pyrimido[1,2-a]indole-10,1'-cyclohexane] —— C16H19BrN2
8-bromospiro[3,4-dihydro-2H-pyrimido[1,2-a]indole-10,1'-cyclohexane]
—— 8-(1-Hydroxypropan-2-ylidene)-1,3-dimethyltricyclo[4.4.0.02,7]decan-3-ol —— C15H24O2
8-(1-Hydroxypropan-2-ylidene)-1,3-dimethyltricyclo[4.4.0.02,7]decan-3-ol
—— (8-acetyloxy-5,8a-dimethyl-1-methylidene-2-oxo-4,5,5a,6,7,8,9,9a-octahydro-3aH-azuleno[6,5-b]furan-6-yl) 3-methylbutanoate —— C22H32O6
(8-acetyloxy-5,8a-dimethyl-1-methylidene-2-oxo-4,5,5a,6,7,8,9,9a-octahydro-3aH-azuleno[6,5-b]furan-6-yl) 3-methylbutanoate