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    热门化合物HOT
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    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 6-[2-(3,4-dimethoxyphenyl)ethyl]-4-methyl-2H-pyrano[3,2-c]pyridine-2,5(6H)-dione —— C19H19NO5
    6-[2-(3,4-dimethoxyphenyl)ethyl]-4-methyl-2H-pyrano[3,2-c]pyridine-2,5(6H)-dione
    —— 6'-hydroxy-O-desmethylangolensin 153409-52-0 C15H14O5
    6'-hydroxy-O-desmethylangolensin
    —— 6-Butyl-2-methyl-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione —— C19H23N3O2
    6-Butyl-2-methyl-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione
    —— 6-Formyl-1,4a-dimethyl-2,3,4,7,8,8a-hexahydronaphthalene-1-carboxylic acid —— C14H20O3
    6-Formyl-1,4a-dimethyl-2,3,4,7,8,8a-hexahydronaphthalene-1-carboxylic acid
    —— 6-Methyl-3-(3-methylbut-2-en-1-yl)hept-5-en-2-yl formate —— C14H24O2
    6-Methyl-3-(3-methylbut-2-en-1-yl)hept-5-en-2-yl formate
    —— [6-(4,5-Dimethyl-6-oxo-2,3-dihydropyran-2-yl)-6,13-dimethyl-8,14-dioxo-7,19-dioxahexacyclo[10.9.0.02,9.05,9.013,18.018,20]henicos-15-en-17-yl] acetate —— C30H36O8
    [6-(4,5-Dimethyl-6-oxo-2,3-dihydropyran-2-yl)-6,13-dimethyl-8,14-dioxo-7,19-dioxahexacyclo[10.9.0.02,9.05,9.013,18.018,20]henicos-15-en-17-yl] acetate
    —— 6-Benzylidene-3-methoxy-3-(2-methylpropyl)piperazine-2,5-dione —— C16H20N2O3
    6-Benzylidene-3-methoxy-3-(2-methylpropyl)piperazine-2,5-dione
    —— [6-[6-[[4,10-Dihydroxy-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 —— C40H67NO14
    [6-[6-[[4,10-Dihydroxy-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-Acetyl-5-hydroxy-2-(4-methoxyphenyl)-7-[3,4,5-trihydroxy-6-[(3,4,5-trihydroxy-6-methyloxan-2-yl)oxymethyl]oxan-2-yl]oxychromen-4-one —— C30H34O15
    6-Acetyl-5-hydroxy-2-(4-methoxyphenyl)-7-[3,4,5-trihydroxy-6-[(3,4,5-trihydroxy-6-methyloxan-2-yl)oxymethyl]oxan-2-yl]oxychromen-4-one
    —— 6-[2-[4a-[[9,10a-dihydroxy-3-(2-methoxy-2-oxoethyl)-1-methyl-5,10-dioxo-3,4-dihydro-1H-benzo[g]isochromen-4a-yl]sulfanyl]-9,10a-dihydroxy-1-methyl-5,10-dioxo-3,4-dihydro-1H-benzo[g]isochromen-3-yl]acetyl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid —— C39H40O20S
    6-[2-[4a-[[9,10a-dihydroxy-3-(2-methoxy-2-oxoethyl)-1-methyl-5,10-dioxo-3,4-dihydro-1H-benzo[g]isochromen-4a-yl]sulfanyl]-9,10a-dihydroxy-1-methyl-5,10-dioxo-3,4-dihydro-1H-benzo[g]isochromen-3-yl]acetyl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid
    —— 6-[13-(2-Carboxyethyl)-4,8-dimethyl-12-prop-1-en-2-yl-5-tetracyclo[7.5.0.01,13.04,8]tetradec-10-enyl]-2-methylhept-2-enoic acid —— C30H44O4
    6-[13-(2-Carboxyethyl)-4,8-dimethyl-12-prop-1-en-2-yl-5-tetracyclo[7.5.0.01,13.04,8]tetradec-10-enyl]-2-methylhept-2-enoic acid
    —— 6-methoxy-2-methyl-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyspiro[3,4-dihydroisoquinoline-1,7'-6H-cyclopenta[g][1,3]benzodioxole]-8'-one —— C26H29NO10
    6-methoxy-2-methyl-7-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyspiro[3,4-dihydroisoquinoline-1,7'-6H-cyclopenta[g][1,3]benzodioxole]-8'-one
    —— 6-Hydroxy-2-(1-hydroxypropyl)-7,8-dimethoxy-2,3,3a,9b-tetrahydrofuro[3,2-c]isochromen-5-one —— C16H20O7
    6-Hydroxy-2-(1-hydroxypropyl)-7,8-dimethoxy-2,3,3a,9b-tetrahydrofuro[3,2-c]isochromen-5-one
    —— 6,7-dimethoxy-5-oxo-N-propyl-3,9b-dihydro-2H-[1,3]thiazolo[2,3-a]isoindole-3-carboxamide —— C16H20N2O4S
    6,7-dimethoxy-5-oxo-N-propyl-3,9b-dihydro-2H-[1,3]thiazolo[2,3-a]isoindole-3-carboxamide
    —— 6-Desmethylsideroxylin —— C17H14O5
    6-Desmethylsideroxylin
    —— 6-methoxy-3-methyl-7,8-methylenedioxy-4-(naphth-2-yl)-1,2-dihydro-3-benzazepine —— C24H21NO4
    6-methoxy-3-methyl-7,8-methylenedioxy-4-(naphth-2-yl)-1,2-dihydro-3-benzazepine
    —— [6-(Dimethylamino)-15-[1-(dimethylamino)ethyl]-14-hydroxy-7,12,16-trimethyl-7-pentacyclo[9.7.0.01,3.03,8.012,16]octadec-9-enyl]methyl acetate —— C30H50N2O3
    [6-(Dimethylamino)-15-[1-(dimethylamino)ethyl]-14-hydroxy-7,12,16-trimethyl-7-pentacyclo[9.7.0.01,3.03,8.012,16]octadec-9-enyl]methyl acetate
    —— 6-benzo[1,3]dioxol-5-yl-hexa-3,5-dien-2-one 17172-93-9 C13H12O3
    6-benzo[1,3]dioxol-5-yl-hexa-3,5-dien-2-one
    —— [6-[7,16-dihydroxy-2-[4-hydroxy-5-[4-hydroxy-5-(hydroxymethyl)-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxolan-2-yl]oxy-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-4,4,9,13,14-pentamethyl-3,11-dioxo-8,10,12,15,16,17-hexahydro-7H-cyclopenta[a]phenanthren-17-yl]-6-hydroxy-2-methyl-5-oxohept-3-en-2-yl] acetate —— C54H80O25
    [6-[7,16-dihydroxy-2-[4-hydroxy-5-[4-hydroxy-5-(hydroxymethyl)-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxolan-2-yl]oxy-3-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxy-4,4,9,13,14-pentamethyl-3,11-dioxo-8,10,12,15,16,17-hexahydro-7H-cyclopenta[a]phenanthren-17-yl]-6-hydroxy-2-methyl-5-oxohept-3-en-2-yl] acetate
    —— 6-[12-acetyloxy-7-hydroxy-4-(hydroxymethyl)-4,10,13,14-tetramethyl-3,11-dioxo-2,5,6,7,12,15,16,17-octahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-methylhept-2-enoic acid —— C32H46O8
    6-[12-acetyloxy-7-hydroxy-4-(hydroxymethyl)-4,10,13,14-tetramethyl-3,11-dioxo-2,5,6,7,12,15,16,17-octahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-methylhept-2-enoic acid
    —— 6-(7-Hydroxy-4,4,10,13,14-pentamethyl-3,11,15-trioxo-1,2,5,6,7,12,16,17-octahydrocyclopenta[a]phenanthren-17-yl)-2-methyl-4-oxohexanoic acid —— C29H40O7
    6-(7-Hydroxy-4,4,10,13,14-pentamethyl-3,11,15-trioxo-1,2,5,6,7,12,16,17-octahydrocyclopenta[a]phenanthren-17-yl)-2-methyl-4-oxohexanoic acid
    —— (6-Hydroxy-3,15-dimethyl-4,13-dioxo-5,14-dioxatetracyclo[6.6.1.02,6.012,15]pentadec-2-en-11-yl) 2-methylbut-2-enoate —— C20H24O7
    (6-Hydroxy-3,15-dimethyl-4,13-dioxo-5,14-dioxatetracyclo[6.6.1.02,6.012,15]pentadec-2-en-11-yl) 2-methylbut-2-enoate
    —— (6a-hydroxy-9a-methyl-3-methylidene-2,9-dioxo-4,5,6,7,8,9b-hexahydro-3aH-azuleno[4,5-b]furan-6-yl)methyl 2-methylbutanoate —— C20H28O6
    (6a-hydroxy-9a-methyl-3-methylidene-2,9-dioxo-4,5,6,7,8,9b-hexahydro-3aH-azuleno[4,5-b]furan-6-yl)methyl 2-methylbutanoate
    —— 6'-Butan-2-yl-24-hydroxy-12-[5-(5-hydroxy-4-methoxy-6-methyloxan-2-yl)oxy-4-methoxy-6-methyloxan-2-yl]oxy-21-methoxy-5',11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2'-oxane]-2-one —— C49H76O14
    6'-Butan-2-yl-24-hydroxy-12-[5-(5-hydroxy-4-methoxy-6-methyloxan-2-yl)oxy-4-methoxy-6-methyloxan-2-yl]oxy-21-methoxy-5',11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2'-oxane]-2-one
    —— 6-(Hydroxymethyl)-1-methyl-3a,11a-dihydronaphtho[1,2-g][1]benzofuran-10,11-dione —— C18H14O4
    6-(Hydroxymethyl)-1-methyl-3a,11a-dihydronaphtho[1,2-g][1]benzofuran-10,11-dione
    —— 6-Bromooctacosa-5,9,24-trienoic acid —— C28H49BrO2
    6-Bromooctacosa-5,9,24-trienoic acid
    —— 6-[(4-Methoxyphenyl)methyl]-2-(3,4,5-trimethoxyphenyl)-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione —— C31H31N3O6
    6-[(4-Methoxyphenyl)methyl]-2-(3,4,5-trimethoxyphenyl)-3,6,17-triazatetracyclo[8.7.0.03,8.011,16]heptadeca-1(10),11,13,15-tetraene-4,7-dione
    —— [6-[2-(3,5-Dihydroxybenzoyl)-3,5-dihydroxyphenoxy]-4,5-dihydroxyoxan-3-yl] acetate —— C20H20O11
    [6-[2-(3,5-Dihydroxybenzoyl)-3,5-dihydroxyphenoxy]-4,5-dihydroxyoxan-3-yl] acetate
    —— 6-[[3a-Carboxy-8-(hydroxymethyl)-5a,5b,8,11a-tetramethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysen-9-yl]oxy]-3,5-dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxane-2-carboxylic acid —— C42H66O15
    6-[[3a-Carboxy-8-(hydroxymethyl)-5a,5b,8,11a-tetramethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysen-9-yl]oxy]-3,5-dihydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxane-2-carboxylic acid
    —— 6-[[8a-[5-Acetyl-4-hydroxy-3-[3-hydroxy-6-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxyoxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-3-hydroxy-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-(3,4,5-trihydroxyoxan-2-yl)oxyoxane-2-carboxylic acid —— C71H110O36
    6-[[8a-[5-Acetyl-4-hydroxy-3-[3-hydroxy-6-methyl-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-2-yl]oxyoxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-3-hydroxy-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-(3,4,5-trihydroxyoxan-2-yl)oxyoxane-2-carboxylic acid
    —— 6,10,19-Trimethyl-24-oxa-4-azaheptacyclo[12.12.0.02,11.04,9.015,25.018,23.019,25]hexacosane-10,12,14,22,23-pentol —— C27H43NO6
    6,10,19-Trimethyl-24-oxa-4-azaheptacyclo[12.12.0.02,11.04,9.015,25.018,23.019,25]hexacosane-10,12,14,22,23-pentol
    —— [6-(Furan-3-yl)-13-hydroxy-16-(1-hydroxy-2-methoxy-2-oxoethyl)-1,5,15,15-tetramethyl-8,17-dioxo-7-oxatetracyclo[11.3.1.02,11.05,10]heptadecan-14-yl] 2-methylbut-2-enoate —— C32H42O10
    [6-(Furan-3-yl)-13-hydroxy-16-(1-hydroxy-2-methoxy-2-oxoethyl)-1,5,15,15-tetramethyl-8,17-dioxo-7-oxatetracyclo[11.3.1.02,11.05,10]heptadecan-14-yl] 2-methylbut-2-enoate
    —— 6-Hydroxy-2-[(3-hydroxy-4-methoxyphenyl)methylidene]-4-methoxy-5-methyl-1-benzofuran-3-one —— C18H16O6
    6-Hydroxy-2-[(3-hydroxy-4-methoxyphenyl)methylidene]-4-methoxy-5-methyl-1-benzofuran-3-one
    —— 6-[6-[(2-Carboxyacetyl)oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-7-(3,4-dihydroxyphenyl)-11-hydroxy-2,8-dioxatricyclo[7.3.1.05,13]trideca-1(12),3,5,9(13),10-pentaene-3-carboxylic acid —— C27H24O16
    6-[6-[(2-Carboxyacetyl)oxymethyl]-3,4,5-trihydroxyoxan-2-yl]oxy-7-(3,4-dihydroxyphenyl)-11-hydroxy-2,8-dioxatricyclo[7.3.1.05,13]trideca-1(12),3,5,9(13),10-pentaene-3-carboxylic acid
    —— (6,7-Diacetyloxy-16-hydroxy-5,5,9-trimethyl-14-methylidene-15-oxo-2-tetracyclo[11.2.1.01,10.04,9]hexadecanyl) acetate —— C26H36O8
    (6,7-Diacetyloxy-16-hydroxy-5,5,9-trimethyl-14-methylidene-15-oxo-2-tetracyclo[11.2.1.01,10.04,9]hexadecanyl) acetate
    —— 6-[2-(6-Carboxy-3,4,5-trihydroxyoxan-2-yl)oxy-4-(5,7-dihydroxy-4-oxochromen-2-yl)phenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid —— C27H26O18
    6-[2-(6-Carboxy-3,4,5-trihydroxyoxan-2-yl)oxy-4-(5,7-dihydroxy-4-oxochromen-2-yl)phenoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid
    —— 6-chloro-N-[(3-iodophenyl)methylideneamino]pyridazin-3-amine —— C11H8ClIN4
    6-chloro-N-[(3-iodophenyl)methylideneamino]pyridazin-3-amine
    —— 6-chloro-N,N-diphenyl-N'-(5-{[2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenyl]amino}pentyl)-1,3,5-triazine-2,4-diamine —— C27H22ClF7N6
    6-chloro-N,N-diphenyl-N'-(5-{[2,3,5,6-tetrafluoro-4-(trifluoromethyl)phenyl]amino}pentyl)-1,3,5-triazine-2,4-diamine
    —— 6-Hydroxy-5-(2-hydroxypropanoyl)-4-pent-1-enylcyclohex-2-en-1-one —— C14H20O4
    6-Hydroxy-5-(2-hydroxypropanoyl)-4-pent-1-enylcyclohex-2-en-1-one
    —— 6-ethylidene-12-hydroxy-4-[3-(hydroxymethyl)phenyl]-9-(1-hydroxy-6-oxospiro[3,4,4a,7,8,8a-hexahydro-2H-naphthalene-5,1'-cyclopentane]-1-yl)-8,15-dioxatricyclo[9.6.2.014,18]nonadeca-11(19),12,14(18)-trien-2-yne-7,16-dione —— C40H44O8
    6-ethylidene-12-hydroxy-4-[3-(hydroxymethyl)phenyl]-9-(1-hydroxy-6-oxospiro[3,4,4a,7,8,8a-hexahydro-2H-naphthalene-5,1'-cyclopentane]-1-yl)-8,15-dioxatricyclo[9.6.2.014,18]nonadeca-11(19),12,14(18)-trien-2-yne-7,16-dione
    —— 6-[2-Carbamoyl-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxy-5-[[[6-(2-ethylphenyl)-3-methylhex-5-enyl]amino]methyl]-3,4,5-trihydroxyoxane-2-carboxylic acid —— C38H42N2O11
    6-[2-Carbamoyl-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxy-5-[[[6-(2-ethylphenyl)-3-methylhex-5-enyl]amino]methyl]-3,4,5-trihydroxyoxane-2-carboxylic acid
    —— 6-(2-Dimethylaminoethyl)-6H-indeno[1,2-c]isoquinolin-5,11-dione 1034251-78-9 C20H18N2O2
    6-(2-Dimethylaminoethyl)-6H-indeno[1,2-c]isoquinolin-5,11-dione
    —— [6-[[2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-2H-chromen-1-ium-3-yl]oxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3-(4-hydroxyphenyl)prop-2-enoate —— C30H29O13+
    [6-[[2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-2H-chromen-1-ium-3-yl]oxy]-3,4,5-trihydroxyoxan-2-yl]methyl 3-(4-hydroxyphenyl)prop-2-enoate
    —— [6-[6-[[4-Acetyloxy-13,14-dihydroxy-5-methoxy-9,16-dimethyl-2,10-dioxo-7-(2-oxoethyl)-oxacyclohexadec-6-yl]oxy]-4-(dimethylamino)-5-hydroxy-2-methyloxan-3-yl]oxy-4-hydroxy-2,4-dimethyloxan-3-yl] 3-methylbutanoate —— C42H71NO17
    [6-[6-[[4-Acetyloxy-13,14-dihydroxy-5-methoxy-9,16-dimethyl-2,10-dioxo-7-(2-oxoethyl)-oxacyclohexadec-6-yl]oxy]-4-(dimethylamino)-5-hydroxy-2-methyloxan-3-yl]oxy-4-hydroxy-2,4-dimethyloxan-3-yl] 3-methylbutanoate
    —— 6-Benzyl-3-butan-2-yl-9-[6-(oxiran-2-yl)-6-oxohexyl]-1,4,7,10-tetrazabicyclo[10.4.0]hexadecane-2,5,8,11-tetrone —— C31H44N4O6
    6-Benzyl-3-butan-2-yl-9-[6-(oxiran-2-yl)-6-oxohexyl]-1,4,7,10-tetrazabicyclo[10.4.0]hexadecane-2,5,8,11-tetrone
    —— 6,8-Dihydroxy-3-(4-hydroxyphenyl)-2-[(3,4,5,6-tetrahydroxyoxan-2-yl)methoxy]chromen-4-one —— C21H20O11
    6,8-Dihydroxy-3-(4-hydroxyphenyl)-2-[(3,4,5,6-tetrahydroxyoxan-2-yl)methoxy]chromen-4-one
    —— 6-[5-(3-Methoxyphenyl)tetrazol-1-yl]-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-3-amine —— C14H17N5O3
    6-[5-(3-Methoxyphenyl)tetrazol-1-yl]-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-3-amine
    —— [6,7-Diacetyloxy-5,11-dihydroxy-10,13-dimethyl-17-(6-methylheptan-2-yl)-1,2,3,4,6,7,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-yl] acetate —— C33H52O8
    [6,7-Diacetyloxy-5,11-dihydroxy-10,13-dimethyl-17-(6-methylheptan-2-yl)-1,2,3,4,6,7,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-yl] acetate
    —— 6-acetyl-4-butyl-5-hydroxy-7-methyl-2H-chromen-2-one —— C16H18O4
    6-acetyl-4-butyl-5-hydroxy-7-methyl-2H-chromen-2-one
    —— [6-[3-acetyloxy-5-ethoxy-2-[2-(hydroxymethyl)-2-methyl-5-oxooxolan-3-yl]-5-oxopentan-2-yl]-5-formyloxy-3-(furan-3-yl)-7a-hydroxy-3a-methyl-7-methylidene-1-oxo-3,4,5,6-tetrahydro-2H-inden-4-yl] 2-hydroxy-3-methylpentanoate —— C37H50O15
    [6-[3-acetyloxy-5-ethoxy-2-[2-(hydroxymethyl)-2-methyl-5-oxooxolan-3-yl]-5-oxopentan-2-yl]-5-formyloxy-3-(furan-3-yl)-7a-hydroxy-3a-methyl-7-methylidene-1-oxo-3,4,5,6-tetrahydro-2H-inden-4-yl] 2-hydroxy-3-methylpentanoate