Acetic acid (R)-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-1-[(3aS,5aR,6S,9aS,9bR)-2,2-dimethyl-5,8-dioxo-5a-(2-trimethylsilanyl-ethoxymethoxymethyl)-decahydro-naphtho[1,2-d][1,3]dioxol-6-yl]-ethyl ester

(3S,3aR,5R,5aS,5bS,9aS,10aS,13aR,13bS,15aR,15bS)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-15b-hydroxy-3a,8,8,12,12-pentamethyl-15-oxohexadecahydro-6H-cyclopenta[7,8][1,3]dioxolo[4',5':1,2]phenanthro[4,4a-d][1,3]dioxin-5-yl acetate

(R)-2-((1R,2S)-2-(((tert-butyldiphenylsilyl)oxy)methyl)-1-methyl-5-oxocyclopentyl)-1-((4S,4aR,8aS,9aS,12aR,12bS)-7,7,11,11-tetramethyl-2-oxooctahydro-2H,5H-[1,3]dioxolo[4',5':3,4]naphtho[1,8a-d][1,3]dioxin-4-yl)ethyl acetate

acetic acid 17-(tert-butyl-diphenyl-silanyloxymethyl)-4,14-dihydroxy-13-methyl-1,7-dioxo-10-(2-trimethylsilanyl-ethoxymethoxymethyl)-4,5,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-11-yl ester

Acetic acid (R)-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-1-((3aS,5S,5aR,6S,9aS,9bR)-5-hydroxy-5a-hydroxymethyl-2,2-dimethyl-8-oxo-decahydro-naphtho[1,2-d][1,3]dioxol-6-yl)-ethyl ester

(3S,3aR,5R,5aS,5bR,9aS,10aS,13aR,13bS,15aR,15bS)-3-(((tert-butyldiphenylsilyl)oxy)methyl)-15b-hydroxy-3a,8,8,12,12-pentamethyl-15-oxo-14-(phenylselanyl)hexadecahydro-6H-cyclopenta[7,8][1,3]dioxolo[4',5':1,2]phenanthro[4,4a-d][1,3]dioxin-5-yl acetate