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