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

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

(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

(3aR,3bR,6aS,7aS)-1,5,5-Trimethyl-hexahydro-[1,3]dioxolo[4',5':3,4]cyclopenta[1,2-c]isoxazole

(3aS,3bR,6aS,7aR)-1,5,5-Trimethyl-hexahydro-[1,3]dioxolo[4',5':3,4]cyclopenta[1,2-c]isoxazole