(1R,4R,5S)-4-(2-Chloro-ethyl)-1-[(S)-1-(isopropyl-dimethyl-silanyloxy)-2-methyl-propyl]-5-methyl-6-oxa-2-aza-bicyclo[3.2.0]heptane-3,7-dione

(3R,3aS,7aR)-3-((S)-1-Hydroxy-2-methyl-propyl)-2-(4-methoxy-benzyl)-3a,5,5-trimethyl-1-oxo-octahydro-4-oxa-2-aza-5-sila-indene-3-carboxylic acid methyl ester

methyl (2R,3S)-1-(4-methoxybenzyl)-2-((benzyloxy)methyl)-3-hydroxy-3-methyl-4-methylene-5-oxopyrrolidine-2-carboxaldehyde