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    中文名称 英文名称 CAS号 化学式 结构式图片
    —— [8,14-dihydroxy-10,13-dimethyl-17-(6-oxopyran-3-yl)-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxy-2,3,4,5,6,7,9,11,12,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-6-yl] acetate —— C32H46O11
    [8,14-dihydroxy-10,13-dimethyl-17-(6-oxopyran-3-yl)-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxy-2,3,4,5,6,7,9,11,12,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-6-yl] acetate
    —— (8,8-Dimethyl-2-oxo-9,10-dihydropyrano[2,3-h]chromen-9-yl) 2-methylpropanoate —— C18H20O5
    (8,8-Dimethyl-2-oxo-9,10-dihydropyrano[2,3-h]chromen-9-yl) 2-methylpropanoate
    —— 8-Tert-butyl-3,6,9-trimethylidene-3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-2-one —— C19H26O2
    8-Tert-butyl-3,6,9-trimethylidene-3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-2-one
    —— 8-Methyl-5-thia-3,8-diaza-18-azoniahexacyclo[9.9.2.02,6.07,22.012,17.018,21]docosa-1,3,6,9,11(22),12,14,16-octaene —— C19H16N3S+
    8-Methyl-5-thia-3,8-diaza-18-azoniahexacyclo[9.9.2.02,6.07,22.012,17.018,21]docosa-1,3,6,9,11(22),12,14,16-octaene
    —— [8-Methyl-3-[3-(3,4,5-trimethoxyphenyl)prop-2-enoyloxy]-8-azabicyclo[3.2.1]octan-6-yl] benzoate —— C27H31NO7
    [8-Methyl-3-[3-(3,4,5-trimethoxyphenyl)prop-2-enoyloxy]-8-azabicyclo[3.2.1]octan-6-yl] benzoate
    —— 8-hydroxy-1,6-dimethoxy-3,4-dihydro-1H-isochromene-7-carbaldehyde —— C12H14O5
    8-hydroxy-1,6-dimethoxy-3,4-dihydro-1H-isochromene-7-carbaldehyde
    —— 8-(2-hydroxyethylcarbamoyl)-3-methyl-4-oxo-2-phenyl-4H-1-benzopyran —— C19H17NO4
    8-(2-hydroxyethylcarbamoyl)-3-methyl-4-oxo-2-phenyl-4H-1-benzopyran
    —— 8-Hydroxy-5,5,9,13-tetramethyltetracyclo[11.2.1.01,10.04,9]hexadec-14-en-7-one —— C20H30O2
    8-Hydroxy-5,5,9,13-tetramethyltetracyclo[11.2.1.01,10.04,9]hexadec-14-en-7-one
    —— 8-[4-(3-Hydroxyprop-1-enyl)-2,6-dimethoxyphenoxy]-2,6-dimethylocta-1,6-dien-4-one —— C21H28O5
    8-[4-(3-Hydroxyprop-1-enyl)-2,6-dimethoxyphenoxy]-2,6-dimethylocta-1,6-dien-4-one
    —— 8-(Hydroxymethyl)-3-(4-hydroxy-3-propan-2-ylphenyl)-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one —— C25H28O10
    8-(Hydroxymethyl)-3-(4-hydroxy-3-propan-2-ylphenyl)-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxychromen-4-one
    —— 8-[(3-methylbenzyl)sulfanyl]-9-(4-methylphenyl)-1,9-dihydro-6H-purin-6-one —— C20H18N4OS
    8-[(3-methylbenzyl)sulfanyl]-9-(4-methylphenyl)-1,9-dihydro-6H-purin-6-one
    —— [8a-(acetyloxymethyl)-4-[1-acetyloxy-2-(5-oxo-2H-furan-3-yl)ethyl]-3-hydroxy-3,4-dimethylspiro[1,2,4a,5,6,7-hexahydronaphthalene-8,2'-oxirane]-1-yl] 2-methylbut-2-enoate —— C29H40O10
    [8a-(acetyloxymethyl)-4-[1-acetyloxy-2-(5-oxo-2H-furan-3-yl)ethyl]-3-hydroxy-3,4-dimethylspiro[1,2,4a,5,6,7-hexahydronaphthalene-8,2'-oxirane]-1-yl] 2-methylbut-2-enoate
    —— 8-Methoxy-6-methyl-1,2-naphthochinon 1935-95-1 C12H10O3
    8-Methoxy-6-methyl-1,2-naphthochinon
    —— (8-Hydroxy-2,6-dimethoxy-9-oxoxanthen-3-yl) acetate —— C17H14O7
    (8-Hydroxy-2,6-dimethoxy-9-oxoxanthen-3-yl) acetate
    —— [8-Acetyloxy-3-(ethoxymethyl)-6-hydroxy-6,10-dimethyl-2-oxo-4,5,7,8-tetrahydrocyclodeca[b]furan-4-yl] 2-methylprop-2-enoate —— C23H30O8
    [8-Acetyloxy-3-(ethoxymethyl)-6-hydroxy-6,10-dimethyl-2-oxo-4,5,7,8-tetrahydrocyclodeca[b]furan-4-yl] 2-methylprop-2-enoate
    —— 8-chloro-2-methyl-3-prop-2-enyl-1H-quinolin-4-one —— C13H12ClNO
    8-chloro-2-methyl-3-prop-2-enyl-1H-quinolin-4-one
    —— (8-acetyloxy-3-methylidene-2-oxospiro[4,5,6a,7,8,9,9a,9b-octahydro-3aH-azuleno[8,7-b]furan-6,2'-oxirane]-9-yl)methyl acetate —— C19H24O7
    (8-acetyloxy-3-methylidene-2-oxospiro[4,5,6a,7,8,9,9a,9b-octahydro-3aH-azuleno[8,7-b]furan-6,2'-oxirane]-9-yl)methyl acetate
    —— (8-Acetyloxy-5,8a-dimethyl-3-methylidene-2,7-dioxo-3a,4,4a,8,9,9a-hexahydrobenzo[f][1]benzofuran-6-yl) 3-methylbutanoate —— C22H28O7
    (8-Acetyloxy-5,8a-dimethyl-3-methylidene-2,7-dioxo-3a,4,4a,8,9,9a-hexahydrobenzo[f][1]benzofuran-6-yl) 3-methylbutanoate
    —— 8-Benzyl-18-cyclohexyl-12,38-dihydroxy-60-methyl-17-methylidene-22,24-diazatridecacyclo[35.15.3.223,26.11,37.16,10.127,31.03,10.04,41.032,50.042,51.044,49.013,60.041,56]hexaconta-3,23(59),26(58),27,29,31(57),43,45,47,49,51,53-dodecaen-34-yne-14-carboxylic acid —— C74H84N2O4
    8-Benzyl-18-cyclohexyl-12,38-dihydroxy-60-methyl-17-methylidene-22,24-diazatridecacyclo[35.15.3.223,26.11,37.16,10.127,31.03,10.04,41.032,50.042,51.044,49.013,60.041,56]hexaconta-3,23(59),26(58),27,29,31(57),43,45,47,49,51,53-dodecaen-34-yne-14-carboxylic acid
    —— (8-chloro-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)(1-methyl-1H-indol-3-yl)methanone —— C21H18ClN3O
    (8-chloro-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)(1-methyl-1H-indol-3-yl)methanone
    —— [8-acetyloxy-6-(hydroxymethyl)-3-methylidene-2,5-dioxo-4,8,9,11a-tetrahydro-3aH-cyclodeca[b]furan-10-yl]methyl 3-methylbutanoate —— C22H28O8
    [8-acetyloxy-6-(hydroxymethyl)-3-methylidene-2,5-dioxo-4,8,9,11a-tetrahydro-3aH-cyclodeca[b]furan-10-yl]methyl 3-methylbutanoate
    —— 8-[4-[4-(4,5-Dihydroxy-6-methyloxan-2-yl)oxy-5-ethyl-2-methoxy-6-methyloxan-2-yl]-3-hydroxypentan-2-yl]-16-[4-[5-ethyl-2-methoxy-6-methyl-4-(4,5,6-trihydroxyoxan-2-yl)oxyoxan-2-yl]-3-hydroxypentan-2-yl]-7,15-dimethyl-1,9-dioxacyclohexadeca-3,5,11,13-tetraene-2,10-dione —— C55H90O19
    8-[4-[4-(4,5-Dihydroxy-6-methyloxan-2-yl)oxy-5-ethyl-2-methoxy-6-methyloxan-2-yl]-3-hydroxypentan-2-yl]-16-[4-[5-ethyl-2-methoxy-6-methyl-4-(4,5,6-trihydroxyoxan-2-yl)oxyoxan-2-yl]-3-hydroxypentan-2-yl]-7,15-dimethyl-1,9-dioxacyclohexadeca-3,5,11,13-tetraene-2,10-dione
    —— 8,16-dimethyl-1,9-dioxacyclohexadeca-3,11-diene-2,5,10,13-tetrone —— C16H20O6
    8,16-dimethyl-1,9-dioxacyclohexadeca-3,11-diene-2,5,10,13-tetrone
    —— 8-methoxycoumarsabin 81425-78-7 C14H16O5
    8-methoxycoumarsabin
    —— (8-hydroxy-5,8-dimethyl-1-methylidene-2-oxo-5a,6,7,8a,9,9a-hexahydro-3aH-azuleno[6,5-b]furan-9-yl) acetate —— C17H22O5
    (8-hydroxy-5,8-dimethyl-1-methylidene-2-oxo-5a,6,7,8a,9,9a-hexahydro-3aH-azuleno[6,5-b]furan-9-yl) acetate
    —— 8a-[3-[4-Acetyloxy-5-[4-[3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3,5-dihydroxyoxan-2-yl]oxy-3-hydroxy-6-methyloxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxycarbonyl-2,8-dihydroxy-4-(hydroxymethyl)-6a,6b,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 —— C59H92O30
    8a-[3-[4-Acetyloxy-5-[4-[3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3,5-dihydroxyoxan-2-yl]oxy-3-hydroxy-6-methyloxan-2-yl]oxy-4,5-dihydroxyoxan-2-yl]oxycarbonyl-2,8-dihydroxy-4-(hydroxymethyl)-6a,6b,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-[5-(Carboxymethyl)oxolan-2-yl]octanoic acid —— C14H24O5
    8-[5-(Carboxymethyl)oxolan-2-yl]octanoic acid
    —— (8a-hydroxy-1,5,8-trimethylidene-2-oxo-4,5a,6,7,9,9a-hexahydro-3aH-azuleno[6,5-b]furan-7-yl) propanoate —— C18H22O5
    (8a-hydroxy-1,5,8-trimethylidene-2-oxo-4,5a,6,7,9,9a-hexahydro-3aH-azuleno[6,5-b]furan-7-yl) propanoate
    —— 8-[2-amino-6-(3-hydroxypropyl)-1,2-dihydropyridin-5-yl]-17-[1,2-dihydroxy-1-(3-methyl-6-propyl-3,3a,4,5,6,7,8,8a-octahydro-2H-cyclohepta[b]furan-2-yl)propan-2-yl]-3,4,14-trihydroxy-24-(2-hydroxypropylamino)hexacyclo[11.9.2.111,18.01,6.06,12.014,18]pentacosa-9,13(24)-dien-20-yn-23-one —— C52H77N3O9
    8-[2-amino-6-(3-hydroxypropyl)-1,2-dihydropyridin-5-yl]-17-[1,2-dihydroxy-1-(3-methyl-6-propyl-3,3a,4,5,6,7,8,8a-octahydro-2H-cyclohepta[b]furan-2-yl)propan-2-yl]-3,4,14-trihydroxy-24-(2-hydroxypropylamino)hexacyclo[11.9.2.111,18.01,6.06,12.014,18]pentacosa-9,13(24)-dien-20-yn-23-one
    —— 8-Hydroperoxy-4-hydroxy-3a,5a,8-trimethyl-1-propan-2-yl-4,5,9,10,10a,10b-hexahydrocyclohepta[e]inden-3-one —— C20H30O4
    8-Hydroperoxy-4-hydroxy-3a,5a,8-trimethyl-1-propan-2-yl-4,5,9,10,10a,10b-hexahydrocyclohepta[e]inden-3-one
    —— 8-(2,4-Difluorophenyl)-4-methyl-2-propyl-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepin-5-one —— C21H22F2N2O2
    8-(2,4-Difluorophenyl)-4-methyl-2-propyl-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepin-5-one
    —— 8-(4-hydroxy-3-methoxyphenyl)-6,7-dimethyl-7,8-dihydro-6H-benzo[f][1,3]benzodioxol-5-one 93710-74-8 C20H20O5
    8-(4-hydroxy-3-methoxyphenyl)-6,7-dimethyl-7,8-dihydro-6H-benzo[f][1,3]benzodioxol-5-one
    —— 8-[5-(5,7-Dihydroxy-4-oxochromen-2-yl)-2-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-5,7-dihydroxy-2-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]chromen-4-one —— C42H38O20
    8-[5-(5,7-Dihydroxy-4-oxochromen-2-yl)-2-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]-5,7-dihydroxy-2-[4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]chromen-4-one
    —— 8a-[3-[5-[3,5-Dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-5-hydroxy-6-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-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 —— C65H104O34
    8a-[3-[5-[3,5-Dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-5-hydroxy-6-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-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-(4-Hydroxy-1-methoxybutan-2-yl)-7-(hydroxymethyl)-46-(1-hydroxypropan-2-ylidene)-19-(6-pentacyclo[12.8.0.01,10.02,7.017,22]docosa-2,4,6,17,19,21-hexaenyl)-2,10,14,44-tetraoxaundecacyclo[24.16.6.31,30.123,27.03,12.06,11.013,43.017,22.030,42.031,40.034,39]dopentaconta-3(12),4,6(11),7,20,23(52),24,26,32,34,36,38,49-tridecaene-9,15,45-trione —— C79H82O11
    8-(4-Hydroxy-1-methoxybutan-2-yl)-7-(hydroxymethyl)-46-(1-hydroxypropan-2-ylidene)-19-(6-pentacyclo[12.8.0.01,10.02,7.017,22]docosa-2,4,6,17,19,21-hexaenyl)-2,10,14,44-tetraoxaundecacyclo[24.16.6.31,30.123,27.03,12.06,11.013,43.017,22.030,42.031,40.034,39]dopentaconta-3(12),4,6(11),7,20,23(52),24,26,32,34,36,38,49-tridecaene-9,15,45-trione
    —— 8-methoxy-1',1'-dimethylspiro[3,6,7,8-tetrahydro-2H-pyrrolo[1,2-a]pyrimidine-4,3'-cyclopentane]-7-ol —— C14H24N2O2
    8-methoxy-1',1'-dimethylspiro[3,6,7,8-tetrahydro-2H-pyrrolo[1,2-a]pyrimidine-4,3'-cyclopentane]-7-ol
    —— 8-Bromo-3,7,7-trimethyltetracyclo[4.4.2.01,6.03,11]dodecan-4-one —— C15H21BrO
    8-Bromo-3,7,7-trimethyltetracyclo[4.4.2.01,6.03,11]dodecan-4-one
    —— 8-({[2-(4-methoxyphenyl)-5-methyl-1,3-oxazol-4-yl]methyl}sulfanyl)-9-(4-methylphenyl)-1,9-dihydro-6H-purin-6-one —— C24H21N5O3S
    8-({[2-(4-methoxyphenyl)-5-methyl-1,3-oxazol-4-yl]methyl}sulfanyl)-9-(4-methylphenyl)-1,9-dihydro-6H-purin-6-one
    —— 8-(6-Cyclopent-2-en-1-yl-7-oxoheptyl)-3'-hydroxy-9-(4-hydroxyphenyl)spiro[bicyclo[9.3.1]pentadeca-1(14),5,11(15),12-tetraene-2,1'-cyclohexane]-3-carboxylic acid —— C39H50O5
    8-(6-Cyclopent-2-en-1-yl-7-oxoheptyl)-3'-hydroxy-9-(4-hydroxyphenyl)spiro[bicyclo[9.3.1]pentadeca-1(14),5,11(15),12-tetraene-2,1'-cyclohexane]-3-carboxylic acid
    —— [8-(2-acetylbuta-1,3-dienyl)-2,6-diacetyloxy-3-hydroxy-4,4,8a-trimethyl-7-oxo-2,3,4a,5,6,8-hexahydro-1H-naphthalen-1-yl] benzoate —— C30H36O9
    [8-(2-acetylbuta-1,3-dienyl)-2,6-diacetyloxy-3-hydroxy-4,4,8a-trimethyl-7-oxo-2,3,4a,5,6,8-hexahydro-1H-naphthalen-1-yl] benzoate
    —— 8-methoxy-3-(2-(5-methoxy-1,2-dimethyl-1H-indol-3-yl)-2-oxoethoxy)-4-methyl-6H-benzo[c]chromen-6-one —— C28H25NO6
    8-methoxy-3-(2-(5-methoxy-1,2-dimethyl-1H-indol-3-yl)-2-oxoethoxy)-4-methyl-6H-benzo[c]chromen-6-one
    —— [8-Acetyloxy-11-ethyl-5,14-dihydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecan-4-yl] benzoate —— C34H47NO10
    [8-Acetyloxy-11-ethyl-5,14-dihydroxy-6,16,18-trimethoxy-13-(methoxymethyl)-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecan-4-yl] benzoate
    —— 8-Hydroxy-11-methoxy-1,6-diazatetracyclo[7.6.1.05,16.010,15]hexadeca-3,5(16),6,8,10,12,14-heptaen-2-one —— C15H10N2O3
    8-Hydroxy-11-methoxy-1,6-diazatetracyclo[7.6.1.05,16.010,15]hexadeca-3,5(16),6,8,10,12,14-heptaen-2-one
    —— 8-Fluoro-4-methyl-2-[(1-methylimidazol-2-yl)methyl]-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepin-5-one —— C17H19FN4O2
    8-Fluoro-4-methyl-2-[(1-methylimidazol-2-yl)methyl]-1,3,3a,10a-tetrahydropyrrolo[3,4-b][1,4]benzoxazepin-5-one
    —— 8-Hydroxy-4,10,11,11-tetramethyltricyclo[5.3.1.01,5]undec-4-en-3-one —— C15H22O2
    8-Hydroxy-4,10,11,11-tetramethyltricyclo[5.3.1.01,5]undec-4-en-3-one
    —— 8-Hydroxy-8-(hydroxymethyl)-5-propan-2-yl-2,4a,5,6,7,8a-hexahydrochromene-3-carboxylic acid —— C14H22O5
    8-Hydroxy-8-(hydroxymethyl)-5-propan-2-yl-2,4a,5,6,7,8a-hexahydrochromene-3-carboxylic acid
    —— 8-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxychromen-2-one —— C19H22O4
    8-(3,7-Dimethylocta-2,6-dienyl)-5,7-dihydroxychromen-2-one
    —— 8,17,28-Trihydroxy-25-[[3-[2-(1-hydroxycyclopentyl)ethyl]-6-(2-hydroxyethyl)-9-(hydroxymethyl)-8-(2-oxopropylamino)-1,2,3,4,5,6-hexahydro-2-benzazocin-1-yl]oxy]-16-methoxy-2,3-dithiapentacyclo[24.2.2.05,14.06,11.015,20]triaconta-5(14),6(11),7,9,12,15(20),16,18-octaen-23-one —— C53H68N2O10S2
    8,17,28-Trihydroxy-25-[[3-[2-(1-hydroxycyclopentyl)ethyl]-6-(2-hydroxyethyl)-9-(hydroxymethyl)-8-(2-oxopropylamino)-1,2,3,4,5,6-hexahydro-2-benzazocin-1-yl]oxy]-16-methoxy-2,3-dithiapentacyclo[24.2.2.05,14.06,11.015,20]triaconta-5(14),6(11),7,9,12,15(20),16,18-octaen-23-one
    —— 8-Benzyl-18-cyclohexyl-12,38-dihydroxy-17-(hydroxymethylidene)-60-methyl-22,24-diazatridecacyclo[35.15.3.223,26.11,37.16,10.127,31.03,10.04,41.032,50.042,51.044,49.013,60.041,56]hexaconta-3,23(59),26(58),27,29,31(57),43,45,47,49,51,53-dodecaen-34-yne-14-carboxylic acid —— C74H84N2O5
    8-Benzyl-18-cyclohexyl-12,38-dihydroxy-17-(hydroxymethylidene)-60-methyl-22,24-diazatridecacyclo[35.15.3.223,26.11,37.16,10.127,31.03,10.04,41.032,50.042,51.044,49.013,60.041,56]hexaconta-3,23(59),26(58),27,29,31(57),43,45,47,49,51,53-dodecaen-34-yne-14-carboxylic acid
    —— (8,9-dihydroxy-5,8a-dimethyl-1-methylidene-2-oxo-4,5,5a,6,7,8,9,9a-octahydro-3aH-azuleno[6,5-b]furan-6-yl) 2-methylbut-2-enoate —— C20H28O6
    (8,9-dihydroxy-5,8a-dimethyl-1-methylidene-2-oxo-4,5,5a,6,7,8,9,9a-octahydro-3aH-azuleno[6,5-b]furan-6-yl) 2-methylbut-2-enoate