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异戊烯醇脂质

中文名称 英文名称 CAS号 化学式 结构式图片
—— methyl 4-[2-[[(1R,2S,4S)-bicyclo[2.2.1]heptane-2-carbonyl]amino]-1,3-thiazol-4-yl]-1H-pyrrole-2-carboxylate —— C17H19N3O3S
methyl 4-[2-[[(1R,2S,4S)-bicyclo[2.2.1]heptane-2-carbonyl]amino]-1,3-thiazol-4-yl]-1H-pyrrole-2-carboxylate
—— 3-(3,4,5-trimethoxyphenyl)-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]propanamide —— C22H33NO4
3-(3,4,5-trimethoxyphenyl)-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]propanamide
—— 2-[(4-fluorophenyl)sulfonyl-methylamino]-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide —— C19H27FN2O3S
2-[(4-fluorophenyl)sulfonyl-methylamino]-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide
—— 2-[2-oxo-3-(trifluoromethyl)pyridin-1-yl]-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide —— C18H23F3N2O2
2-[2-oxo-3-(trifluoromethyl)pyridin-1-yl]-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide
—— 4-(dimethylsulfamoyl)-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]benzamide —— C19H28N2O3S
4-(dimethylsulfamoyl)-N-[(1R,2R,4R)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]benzamide
—— 2-(3,4,5-trimethoxyphenyl)-N-[(1S,2R,4S)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide —— C21H31NO4
2-(3,4,5-trimethoxyphenyl)-N-[(1S,2R,4S)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide
—— 2-[2-oxo-3-(trifluoromethyl)pyridin-1-yl]-N-[(1S,2R,4S)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide —— C18H23F3N2O2
2-[2-oxo-3-(trifluoromethyl)pyridin-1-yl]-N-[(1S,2R,4S)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]acetamide
—— 2-[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]-N-(cyclopropylmethyl)acetamide —— C13H21NO
2-[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]-N-(cyclopropylmethyl)acetamide
—— (1S,2R,4aR,6aS,6aS,6bS,8aR,9R,10R,11R,12aR,14bR)-10,11-dihydroxy-9-(hydroxymethyl)-1,2,6a,6b,9,12a-hexamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid —— C30H48O5
(1S,2R,4aR,6aS,6aS,6bS,8aR,9R,10R,11R,12aR,14bR)-10,11-dihydroxy-9-(hydroxymethyl)-1,2,6a,6b,9,12a-hexamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid
—— (1R,4S,5S,8R,9R,12R,13R)-1,5,9-trimethyl-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]hexadecan-10-one —— C15H22O5
(1R,4S,5S,8R,9R,12R,13R)-1,5,9-trimethyl-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]hexadecan-10-one
—— Tocris-1099 —— C22H34O7
Tocris-1099
—— (3R,3aR,5aS,9bR)-3,5a,9-trimethyl-3a,4,5,9b-tetrahydro-3H-benzo[g][1]benzofuran-2,8-dione —— C15H18O3
(3R,3aR,5aS,9bR)-3,5a,9-trimethyl-3a,4,5,9b-tetrahydro-3H-benzo[g][1]benzofuran-2,8-dione
—— Tocris-1603 —— C27H43NO8
Tocris-1603
—— [(1R,2S,3R,4S,7R,9S,10R,12R,15S)-4,12-diacetyloxy-15-[(2S,3S)-3-benzamido-2-hydroxy-3-phenylpropanoyl]oxy-1,9-dihydroxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-2-yl] benzoate —— C47H51NO14
[(1R,2S,3R,4S,7R,9S,10R,12R,15S)-4,12-diacetyloxy-15-[(2S,3S)-3-benzamido-2-hydroxy-3-phenylpropanoyl]oxy-1,9-dihydroxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-2-yl] benzoate
—— (2S,4aS,6aS,6aR,6bR,8aR,10S,12aS,14bR)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylic acid —— C30H46O4
(2S,4aS,6aS,6aR,6bR,8aR,10S,12aS,14bR)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylic acid
—— (1S,3R,6R,7R,8S,10R,11S,13R,16S,17R)-8-tert-butyl-6,17-dihydroxy-16-methyl-2,4,14,19-tetraoxahexacyclo[8.7.2.01,11.03,7.07,11.013,17]nonadecane-5,15,18-trione —— C20H24O9
(1S,3R,6R,7R,8S,10R,11S,13R,16S,17R)-8-tert-butyl-6,17-dihydroxy-16-methyl-2,4,14,19-tetraoxahexacyclo[8.7.2.01,11.03,7.07,11.013,17]nonadecane-5,15,18-trione
—— disodium;(2R,4aS,6aS,6aR,6bS,8aR,10S,12aS,14bS)-10-(3-carboxylatopropanoyloxy)-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylate —— C34H48Na2O7
disodium;(2R,4aS,6aS,6aR,6bS,8aR,10S,12aS,14bS)-10-(3-carboxylatopropanoyloxy)-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylate
—— dipotassium;[(2R,3S,4S,5S,6R)-2-[[(1S,4R,5R,7S,9S,10S,13R,15S)-5-carboxy-15-hydroxy-9-methyl-14-methylidene-7-tetracyclo[11.2.1.01,10.04,9]hexadecanyl]oxy]-6-(hydroxymethyl)-3-(3-methylbutanoyloxy)-5-sulfonatooxyoxan-4-yl] sulfate —— C30H44K2O16S2
dipotassium;[(2R,3S,4S,5S,6R)-2-[[(1S,4R,5R,7S,9S,10S,13R,15S)-5-carboxy-15-hydroxy-9-methyl-14-methylidene-7-tetracyclo[11.2.1.01,10.04,9]hexadecanyl]oxy]-6-(hydroxymethyl)-3-(3-methylbutanoyloxy)-5-sulfonatooxyoxan-4-yl] sulfate
—— (1S,2R,4aR,6aR,6aS,6bS,8aR,10S,12aR,14bR)-10-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid —— C30H48O3
(1S,2R,4aR,6aR,6aS,6bS,8aR,10S,12aR,14bR)-10-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid
—— (2R,4aS,6aS,6aR,6bS,8aR,10S,12aS,14bS)-10-(3-carboxypropanoyloxy)-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylic acid —— C34H50O7
(2R,4aS,6aS,6aR,6bS,8aR,10S,12aS,14bS)-10-(3-carboxypropanoyloxy)-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carboxylic acid
—— 6-[(3R,4R,5R,7S)-7-[(2S,3R,5S)-5-ethyl-5-[(2S,5S,6S)-5-ethyl-5-hydroxy-6-methyloxan-2-yl]-3-methyloxolan-2-yl]-4-hydroxy-3,5-dimethyl-6-oxononyl]-2-hydroxy-3-methylbenzoic acid —— C34H54O8
6-[(3R,4R,5R,7S)-7-[(2S,3R,5S)-5-ethyl-5-[(2S,5S,6S)-5-ethyl-5-hydroxy-6-methyloxan-2-yl]-3-methyloxolan-2-yl]-4-hydroxy-3,5-dimethyl-6-oxononyl]-2-hydroxy-3-methylbenzoic acid
—— (1R,2R,4R,5'S,6S,7S,8R,9R,12R,13S,16S,18S)-16-hydroxy-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-10-one —— C27H42O4
(1R,2R,4R,5'S,6S,7S,8R,9R,12R,13S,16S,18S)-16-hydroxy-5',7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6,2'-oxane]-10-one
—— (2R,3S)-2-methyl-3-[(2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraenyl]-2,3-dihydronaphthalene-1,4-dione —— C31H42O2
(2R,3S)-2-methyl-3-[(2E,6E,10E)-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraenyl]-2,3-dihydronaphthalene-1,4-dione
—— (1S,3aS,5aR,5bS,7aR,9R,11aR,11bS,13aS,13bS)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysene-3a-carboxylic acid —— C30H48O3
(1S,3aS,5aR,5bS,7aR,9R,11aR,11bS,13aS,13bS)-9-hydroxy-5a,5b,8,8,11a-pentamethyl-1-prop-1-en-2-yl-1,2,3,4,5,6,7,7a,9,10,11,11b,12,13,13a,13b-hexadecahydrocyclopenta[a]chrysene-3a-carboxylic acid
—— (1S,3aS,5aR,5bS,7aR,9R,11aR,11bS,13aS,13bS)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-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-ol —— C30H50O2
(1S,3aS,5aR,5bS,7aR,9R,11aR,11bS,13aS,13bS)-3a-(hydroxymethyl)-5a,5b,8,8,11a-pentamethyl-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-ol
—— Lopac-P-0667 —— C15H20O3
Lopac-P-0667
—— (1R,2R,4aR,6aS,6aS,6bS,8aR,10R,12aR,14bR)-10-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid —— C30H48O3
(1R,2R,4aR,6aS,6aS,6bS,8aR,10R,12aR,14bR)-10-hydroxy-1,2,6a,6b,9,9,12a-heptamethyl-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylic acid
—— (1R,3R,6R,7R,8S,10R,11R,13R,16S,17R)-8-tert-butyl-6,17-dihydroxy-16-methyl-2,4,14,19-tetraoxahexacyclo[8.7.2.01,11.03,7.07,11.013,17]nonadecane-5,15,18-trione —— C20H24O9
(1R,3R,6R,7R,8S,10R,11R,13R,16S,17R)-8-tert-butyl-6,17-dihydroxy-16-methyl-2,4,14,19-tetraoxahexacyclo[8.7.2.01,11.03,7.07,11.013,17]nonadecane-5,15,18-trione
—— (1S,2S,5R,8R,9R,10R,11R,12R)-5,12-dihydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadec-13-ene-9-carboxylic acid —— C19H22O6
(1S,2S,5R,8R,9R,10R,11R,12R)-5,12-dihydroxy-11-methyl-6-methylidene-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadec-13-ene-9-carboxylic acid
—— (1S,2S,4R,5S,7S,8S,9R,10S,13R,16S,17R)-11-ethyl-13-methyl-6-methylidene-11-azahexacyclo[7.7.2.15,8.01,10.02,8.013,17]nonadecane-4,7,16-triol —— C22H33NO3
(1S,2S,4R,5S,7S,8S,9R,10S,13R,16S,17R)-11-ethyl-13-methyl-6-methylidene-11-azahexacyclo[7.7.2.15,8.01,10.02,8.013,17]nonadecane-4,7,16-triol
—— Lopac-P-119 —— C23H34BrN3O3
Lopac-P-119
—— Lopac-M-9020 —— C11H21N
Lopac-M-9020
—— Lopac-H-7779 —— C26H33NO2
Lopac-H-7779
—— 2-[(1R,2S,4S)-2-bicyclo[2.2.1]heptanyl]-N-(2-cyanoethyl)-N-cyclopropylacetamide —— C15H22N2O
2-[(1R,2S,4S)-2-bicyclo[2.2.1]heptanyl]-N-(2-cyanoethyl)-N-cyclopropylacetamide
—— Lopac-F-6886 —— C22H34O7
Lopac-F-6886
—— 2-[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]-N-(2-cyanoethyl)-N-cyclopropylacetamide —— C15H22N2O
2-[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]-N-(2-cyanoethyl)-N-cyclopropylacetamide
—— (1R,2R,3R,4S)-3-(propan-2-yl)bicyclo[2.2.1]heptan-2-amine —— C10H19N
(1R,2R,3R,4S)-3-(propan-2-yl)bicyclo[2.2.1]heptan-2-amine
—— Lopac-B-015 —— C24H37BrN2O3
Lopac-B-015
—— (3S)-1-methyl-N-[(4-propan-2-ylphenyl)methyl]pyrrolidin-3-amine —— C15H24N2
(3S)-1-methyl-N-[(4-propan-2-ylphenyl)methyl]pyrrolidin-3-amine
—— (3S)-1-methyl-N-[(1R)-1-(4-propan-2-ylphenyl)ethyl]pyrrolidin-3-amine —— C16H26N2
(3S)-1-methyl-N-[(1R)-1-(4-propan-2-ylphenyl)ethyl]pyrrolidin-3-amine
—— (1R,2R,4S)-N-(2-cyanoethyl)-N-propan-2-ylbicyclo[2.2.1]heptane-2-carboxamide —— C14H22N2O
(1R,2R,4S)-N-(2-cyanoethyl)-N-propan-2-ylbicyclo[2.2.1]heptane-2-carboxamide
—— (1R,2R,4S)-N-[(3E)-3-amino-3-hydroxyiminopropyl]-N-propan-2-ylbicyclo[2.2.1]heptane-2-carboxamide —— C14H25N3O2
(1R,2R,4S)-N-[(3E)-3-amino-3-hydroxyiminopropyl]-N-propan-2-ylbicyclo[2.2.1]heptane-2-carboxamide
—— [(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl] (1S,2R,4aS,6bR,9R,10S,12aR,14bS)-10-hydroxy-1,2,6a,6b,9,12a-hexamethyl-9-(sulfooxymethyl)-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylate —— C42H68O17S
[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]oxan-2-yl] (1S,2R,4aS,6bR,9R,10S,12aR,14bS)-10-hydroxy-1,2,6a,6b,9,12a-hexamethyl-9-(sulfooxymethyl)-2,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydro-1H-picene-4a-carboxylate
—— C-17-epi-Deoxy-0,8-salinomycin —— C42H70O11
C-17-epi-Deoxy-0,8-salinomycin
—— (1R,4R,5R,7R,9R,10S,15S)-15-hydroxy-7-[6-(hydroxymethyl)-3-(3-methylbutanoyloxy)-4,5-disulfooxyoxan-2-yl]oxy-9-methyl-14-methylidenetetracyclo[11.2.1.01,10.04,9]hexadecane-5-carboxylic acid —— C30H46O16S2
(1R,4R,5R,7R,9R,10S,15S)-15-hydroxy-7-[6-(hydroxymethyl)-3-(3-methylbutanoyloxy)-4,5-disulfooxyoxan-2-yl]oxy-9-methyl-14-methylidenetetracyclo[11.2.1.01,10.04,9]hexadecane-5-carboxylic acid
—— [(2S,3S,6S,10S,13R,14S,17R)-10,13,14-trimethyl-17-[4-(2-methyl-1-propan-2-ylcyclopropyl)butan-2-yl]-2,3-disulfooxy-1,2,3,4,5,6,7,8,12,15,16,17-dodecahydrocyclopenta[a]phenanthren-6-yl] hydrogen sulfate —— C31H52O12S3
[(2S,3S,6S,10S,13R,14S,17R)-10,13,14-trimethyl-17-[4-(2-methyl-1-propan-2-ylcyclopropyl)butan-2-yl]-2,3-disulfooxy-1,2,3,4,5,6,7,8,12,15,16,17-dodecahydrocyclopenta[a]phenanthren-6-yl] hydrogen sulfate
—— (E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bS)-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E,34E)-3,7,11,15,19,23,27,31,35,39-decamethyltetraconta-2,6,10,14,18,22,26,30,34,38-decaenyl]sulfanylethylcarbamoyl]-4,4,6a,6b,8a,11,14b-heptamethyl-14-oxo-2,3,4a,5,6,7,8,9,10,12,12a,14a-dodecahydro-1H-picen-3-yl]oxy]-4-oxobut-2-enoic acid —— C86H133NO6S
(E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bS)-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E,34E)-3,7,11,15,19,23,27,31,35,39-decamethyltetraconta-2,6,10,14,18,22,26,30,34,38-decaenyl]sulfanylethylcarbamoyl]-4,4,6a,6b,8a,11,14b-heptamethyl-14-oxo-2,3,4a,5,6,7,8,9,10,12,12a,14a-dodecahydro-1H-picen-3-yl]oxy]-4-oxobut-2-enoic acid
—— (E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bR)-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E,34E)-3,7,11,15,19,23,27,31,35,39-decamethyltetraconta-2,6,10,14,18,22,26,30,34,38-decaenyl]sulfanylethylcarbamoyl]-4,4,6a,6b,8a,11,14b-heptamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-4-oxobut-2-enoic acid —— C86H135NO5S
(E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bR)-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E,34E)-3,7,11,15,19,23,27,31,35,39-decamethyltetraconta-2,6,10,14,18,22,26,30,34,38-decaenyl]sulfanylethylcarbamoyl]-4,4,6a,6b,8a,11,14b-heptamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-4-oxobut-2-enoic acid
—— (4R,6S,8S,10E,12R,14R,16E,18R,19R,20S,21S)-11,19,21-trihydroxy-22-[(2S,5S)-5-[(2R,5S)-5-[(1R)-1-hydroxyethyl]-5-methyloxolan-2-yl]-5-methyloxolan-2-yl]-4,6,8,12,14,18,20-heptamethyl-9-oxodocosa-10,16-dienoic acid —— C41H72O9
(4R,6S,8S,10E,12R,14R,16E,18R,19R,20S,21S)-11,19,21-trihydroxy-22-[(2S,5S)-5-[(2R,5S)-5-[(1R)-1-hydroxyethyl]-5-methyloxolan-2-yl]-5-methyloxolan-2-yl]-4,6,8,12,14,18,20-heptamethyl-9-oxodocosa-10,16-dienoic acid
—— (E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bR)-4,4,6a,6b,8a,11,14b-heptamethyl-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethylhexatriaconta-2,6,10,14,18,22,26,30,34-nonaenyl]sulfanylethylcarbamoyl]-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-4-oxobut-2-enoic acid —— C81H127NO5S
(E)-4-[[(3S,6aR,6bS,8aS,11R,12aS,14bR)-4,4,6a,6b,8a,11,14b-heptamethyl-11-[2-[(2E,6E,10E,14E,18E,22E,26E,30E)-3,7,11,15,19,23,27,31,35-nonamethylhexatriaconta-2,6,10,14,18,22,26,30,34-nonaenyl]sulfanylethylcarbamoyl]-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-4-oxobut-2-enoic acid