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CAS 82543-16-6
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one
Codes：(VIII)169995-1-a、(IX)169995-4-a、(VI)169995-8-a、(I)169995-11-a,(IX)169995-11-b、(I)169995-14-a、(I)169995-17-a、(I)169995-18-a、(I)169995-19-a、(I)169995-20-a、(I)169995-22-a、(II)169995-23-a、(I)169995-24-a
Application context (from source-drug indications)
避孕屈螺酮口腔炎，口疮屈螺酮经前焦虑性障碍屈螺酮经前期综合征屈螺酮痛经屈螺酮抑郁屈螺酮
Source drugs (routes using this intermediate)
| Drug | Tier | Expiry |
|---|---|---|
| 屈螺酮Drospirenone | Tier C — Watch / trade | - |
Position in synthesis routes (up/downstream chain)
Ordered by route registration; left → right is the synthesis direction. The highlighted node is the current CAS; others link to their own profiles.
(2S,4aR,4bS,6aS,7aS,8aS,8bR,8cR)-2-Hydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,9-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,9R)-2,9-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,9-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,9R)-9-Hydroxy-4a,6a-dimethyl-7-oxo-1,2,3,4,4a,4b,5,6,6a,7,7a,8,8a,8b,8c,9-hexadecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-2-yl 2,2-dimethylpropanoate→(1aS,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,10R,10aR)-10-Hydroxy-5a,7a-dimethyl-8-oxohexadecahydro-2H-cyclopropa[4',5']cyclopenta[1',2':1,2]phenanthro[8a,9-b]oxiren-3-yl 2,2-dimethylpropanoate→(1aS,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,10S,10aS)-10-Chloro-5a,7a-dimethyl-8-oxohexadecahydro-2H-cyclopropa[4',5']cyclopenta[1',2':1,2]phenanthro[8a,9-b]oxiren-3-yl 2,2-dimethylpropanoate→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-10a-Hydroxy-4a,6a-dimethyl-7-oxo-1,2,3,4,4a,4b,5,6,6a,7,7a,8,8a,8b,8c,10a-hexadecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-2-yl 2,2-dimethylpropanoate→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-2,10a-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,10a-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3-Hydroxy-1-propyne→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxyprop-1-yn-1-yl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1R,2R,4R,5R,10R,11S,14S,15S,16S,18S,19S)-5-Hydroxy-10,14-dimethylspiro[hexacyclo[9.8.0.0(2,4).0(5,10).0(14,19).0(16,18)]nonadecane-15,2'-oxolane]-5',7-dione→1-Bromanyl-3-methoxy-propane→(3-Methoxypropyl)lithium→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Methoxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol
(2S,4aR,4bS,6aS,7aS,8aS,8bR,8cR)-2-Hydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,9-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(3S,5S,7S,11R,14S)-7,11-dimethyl-6-oxopentacyclo[8.8.0.0(2,7).0(3,5).0(11,16)]octadec-16-en-14-yl acetate→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,9R)-2,9-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,9-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(3S,5S,7S,11R,14S,18R)-14-[(tert-butyldimethylsilyl)oxy]-18-hydroxy-7,11-dimethylpentacyclo[8.8.0.0(2,7).0(3,5).0(11,16)]octadec-16-en-6-one→(2R,5S,7S,9R,10R,13S,15S,17S)-5-[(tert-butyldimethylsilyl)oxy]-10-hydroxy-2,17-dimethyl-8-oxahexacyclo[9.8.0.0(2,7).0(7,9).0(12,17).0(13,15)]nonadecan-16-one→(1aS,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,10S,10aS)-10-Chloro-5a,7a-dimethyl-8-oxohexadecahydro-2H-cyclopropa[4',5']cyclopenta[1',2':1,2]phenanthro[8a,9-b]oxiren-3-yl 2,2-dimethylpropanoate→(2R,5S,7S,9S,10S,13S,15S,17S)-10-chloro-5-hydroxy-2,17-dimethyl-8-oxahexacyclo[9.8.0.0(2,7).0(7,9).0(12,17).0(13,15)]nonadecan-16-one→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-2,10a-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,10a-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3-Hydroxy-1-propyne→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxyprop-1-yn-1-yl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1R,2R,4R,5R,10R,11S,14S,15S,16S,18S,19S)-5-Hydroxy-10,14-dimethylspiro[hexacyclo[9.8.0.0(2,4).0(5,10).0(14,19).0(16,18)]nonadecane-15,2'-oxolane]-5',7-dione
1-[2(R)-(2,4-Difluorophenyl)-2-hydroxy-1(R)-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-3-[4-(1H-tetrazol-1-yl)phenyl]imidazolidin-2-one→(2R,5S,7S,9R,10R,13S,15S,17S)-10-(methanesulfonyloxy)-2,17-dimethyl-16-oxo-8-oxahexacyclo[9.8.0.0(2,7).0(7,9).0(12,17).0(13,15)]nonadecan-5-yl 2,2-dimethylpropanoate→(2R,5S,7S,9S,10S,13S,15S,17S)-10-bromo-2,17-dimethyl-16-oxo-8-oxahexacyclo[9.8.0.0(2,7).0(7,9).0(12,17).0(13,15)]nonadecan-5-yl 2,2-dimethylpropanoate→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-10a-Hydroxy-4a,6a-dimethyl-7-oxo-1,2,3,4,4a,4b,5,6,6a,7,7a,8,8a,8b,8c,10a-hexadecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-2-yl 2,2-dimethylpropanoate→(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-2,10a-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,10a-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3-Hydroxy-1-propyne→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxyprop-1-yn-1-yl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3beta-[tert-Butyl(dimethyl)silyloxy]-5beta-hydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-one→(Ethoxycarbonyl)acetylene→3-[3beta-[tert-Butyl(dimethyl)silyloxy]-5beta,17beta-dihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl]-2-propynoic acid ethyl ester→3-[3beta,5beta,17beta-Trihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl]-2-propynoic acid ethyl ester→3-[5beta,17beta-Dihydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrostan-17-yl]-2-propynoic acid ethyl ester→3-[17beta-Hydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrost-4-en-17-yl]-2-propynoic acid ethyl ester→3-[17beta-Hydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrost-4-en-17-yl]-2-propynoic acid
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→(Ethoxycarbonyl)acetylene→3-[3beta,5beta,17beta-Trihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl]-2-propynoic acid ethyl ester→5beta-Hydroxy-6beta,7beta:15beta,16beta-dimethylene-3beta-(trimethylsilyloxy)androstan-17-one→3-[5beta,17beta-Dihydroxy-6beta,7beta:15beta,16beta-dimethylene-3beta-(trimethylsilyloxy)androstan-17-yl]-2-propynoic acid ethyl ester
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→O-tert-Butyldimethylsilyl propargyl alcohol→(1aR,1bR,3S,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-8-[3-[tert-Butyl(dimethyl)silyloxy]-1-propynyl]-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,3S,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-8-[3-[tert-Butyl(dimethyl)silyloxy]propyl]-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-8-[3-[tert-Butyl(dimethyl)silyloxy]propyl]-1b,8-dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-3-one→(1aR,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-8-[3-[tert-Butyl(dimethyl)silyloxy]propyl]-8-hydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-3-one→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→tert-Butyl(3-chloropropoxy)dimethylsilane→1-Chloro-3-hydroxypropane
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→(Ethoxycarbonyl)acetylene→3-(3beta,5beta,17alpha-Trihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl)-2-propynoic acid ethyl ester→3-(3beta,5beta,17alpha-dihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl)propionic acid ethyl ester→3-(5beta,17alpha-Dihydroxy-3-oxo-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl)propionic acid ethyl ester→3-(5beta,17alpha-Dihydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrostan-17-yl)-2-propynoic acid ethyl ester→3-(17alpha-Hydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrost-4-en-17-yl)-2-propynoic acid ethyl ester→3-(17alpha-Hydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrost-4-en-17-yl)propionic acid ethyl ester
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→2-(3-Chloropropoxy)oxane→1-Chloro-3-hydroxypropane→(1aR,1bR,3S,5aR,5bS,7aS,8S,9R,10aS,10bS,10cR)-5a,7a-Dimethyl-9-[3-(tetrahydro-2H-pyran-2-yloxy)propyl]hexadecahydrocyclopenta[a]cyclopropa[l]phenanthrene-1b,3,8(1H)-triol→2-(2-Bromoethyl)-1,3-dioxolane→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-[2-(1,3-Dioxolan-2-yl)ethyl]-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3-Bromo-1,1-dimethoxypropane→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3,3-Dimethoxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3,3-Dimethoxypropyl)-8-hydroxy-5a,7a-dimethyl-1,1a,4,5,5a,5b,6,7,7a,8,8a,9,9a,9b,9c,9d-hexadecahydro-3H-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-3-one
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→(3-Chloropropoxy)(trimethyl)silane→1-Chloro-3-hydroxypropane→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-5a,7a-Dimethyl-8-[3-[(trimethylsilyl)oxy]propyl]octadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(1R,2R,4R,5R,10R,11S,14S,15S,16S,18S,19S)-5-Hydroxy-10,14-dimethylspiro[hexacyclo[9.8.0.0(2,4).0(5,10).0(14,19).0(16,18)]nonadecane-15,2'-oxolane]-5',7-dione
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→(Ethoxycarbonyl)acetylene→3-[3beta,5beta,17beta-Trihydroxy-6beta,7beta:15beta,16beta-dimethyleneandrostan-17-yl]-2-propynoic acid ethyl ester→3-[5beta,17beta-Dihydroxy-6beta,7beta:15beta,16beta-dimethylene-3-oxoandrostan-17-yl]-2-propynoic acid ethyl ester→Ethyl 3-[(1aR,1bR,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-1b,8-dihydroxy-5a,7a-dimethyl-3-oxooctadecahydro-1H-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-yl]propanoate→Potassium 3-[(1aR,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-hydroxy-5a,7a-dimethyl-3-oxo-1a,3,4,5,5a,5b,6,7,7a,8,8a,9,9a,9b,9c,9d-hexadecahydro-1H-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-yl]propanoate→Sodium 3-[(1aR,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-hydroxy-5a,7a-dimethyl-3-oxo-1a,3,4,5,5a,5b,6,7,7a,8,8a,9,9a,9b,9c,9d-hexadecahydro-1H-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-yl]propanoate
(2S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,10aR)-2,10a-Dihydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,7a,8,8a,8b,8c,10a-tetradecahydrocyclopropa[4,5]cyclopenta[1,2-a]phenanthren-7(1H)-one→(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→3-Bromopropionic acid methyl ester→Methyl 3-[(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-1b,3,8-trihydroxy-5a,7a-dimethyloctadecahydro-1H-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-yl]propanoate→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-8-(3-Hydroxypropyl)-5a,7a-dimethyloctadecahydro-1bH-cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-1b,3,8-triol→(2R,4R,5R,7S,10R,14S,15S,16S,18S)-5,7-Dihydroxy-10,14-dimethylspiro[hexacyclo[9.8.0.0(2,4).0(5,10).0(14,19).0(16,18)]nonadecane-15,2'-oxolane]-5'-one
(1aR,1bR,3S,5aR,5bS,7aS,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethylperhydrocyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthren-8-one→(1aR,1bR,3S,5aR,5bS,7aS,8S,8aS,9aS,9bS,9cR,9dR)-5a,7a-Dimethylhexadecahydrospiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-oxirane]-1b,3(2H)-diol→3-(Ethoxycarbonyl)-2-oxopropan-1-ide→Carbethoxyacetic ester→Sodium 3-ethoxy-3-oxopropanoate→(1aR,1bR,3S,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b,3-Dihydroxy-5a,7a-dimethyl-5'-oxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylic acid→Ethyl (1aR,1bR,3S,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b,3-dihydroxy-5a,7a-dimethyl-5'-oxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylate→(1aR,1bR,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b-Hydroxy-5a,7a-dimethyl-3,5'-dioxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylic acid→Ethyl (1aR,1bR,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b-hydroxy-5a,7a-dimethyl-3,5'-dioxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylate→Sodium (1aR,1bR,3S,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b,3-dihydroxy-5a,7a-dimethyl-5'-oxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylate→Sodium (1aR,1bR,5aR,5bS,7aS,8R,8aS,9aS,9bS,9cR,9dR)-1b-hydroxy-5a,7a-dimethyl-3,5'-dioxoicosahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-8,2'-furan]-3'-carboxylate
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