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

2-((4S,5S)-5-Formyl-2,2-dimethyl-[1,3]dioxolan-4-yl)-N-methoxy-N-methyl-acetamide

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

(3aS,7aR)-6-Hydroxymethyl-2,2-dimethyl-3a,4,5,7a-tetrahydro-benzo[1,3]dioxol-5-ol

2-((4S,5R)-5-Hydroxymethyl-2,2-dimethyl-[1,3]dioxolan-4-yl)-N-methoxy-N-methyl-acetamide

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

6-{1-acetoxy-2-[2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-ethyl}-5a-formyl-8-hydroxy-2,2-dimethyl-5-oxo-3a,4,5,5a,6,7,9a,9b-octahydro-naphtho[1,2-d][1,3]dioxole-9-carboxylic acid allyl ester

((4S,5R)-2,2-Dimethyl-5-vinyl-[1,3]dioxolan-4-yl)-acetaldehyde

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

(3aR,7aS)-2,2-Dimethyl-6-oxo-3a,6,7,7a-tetrahydro-benzo[1,3]dioxole-5-carbaldehyde

4-((4S,5R)-2,2-Dimethyl-5-vinyl-[1,3]dioxolan-4-yl)-2-methylene-butane-1,3-diol

2-((4S,5R)-2,2-Dimethyl-5-vinyl-[1,3]dioxolan-4-yl)-N-methoxy-N-methyl-acetamide

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