(R)-2-Acetoxy-3-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-propionic acid

Acetic acid (R)-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-1-ethylsulfanylcarbonyl-ethyl ester

(E)-(R)-6-Acetoxy-7-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-3-oxo-hept-4-enoic acid allyl ester

(1S,4aS,5S,8aS)-5-{(R)-1-Acetoxy-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-ethyl}-1-(tert-butyl-diphenyl-silanyloxy)-4,7-dioxo-octahydro-naphthalene-4a-carboxylic acid methyl ester

(4S,4aS,8S,8aS)-4-{(R)-1-Acetoxy-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-ethyl}-8-(tert-butyl-diphenyl-silanyloxy)-2,5-dioxo-octahydro-naphthalene-1,4a-dicarboxylic acid 1-allyl ester 4a-methyl ester