(5R,10S)-14-Hydroxy-13-methyl-1,7,17-trioxo-1,2,3,4,5,6,7,11,12,13,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthrene-10-carboxylic acid methyl ester
(4aR,8aS)-4,7-Dioxo-5-vinyl-1,3,4,7,8,8a-hexahydro-2H-naphthalene-4a-carboxylic acid methyl ester
2-Oxo-6-(2-oxo-hex-5-en-3-ynyl)-cyclohexanecarboxylic acid methyl ester
2-Methylcyclopentane-1,3-dione
(5R,10S,13S,14S)-7-(tert-Butyl-dimethyl-silanyloxy)-14-hydroxy-13-methyl-1,17-dioxo-1,2,3,4,5,6,12,13,14,15,16,17-dodecahydro-cyclopenta[a]phenanthrene-10-carboxylic acid methyl ester