(S)-4-Benzyl-3-[(E)-(S)-4-(tert-butyl-dimethyl-silanyloxy)-4-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-but-2-enoyl]-oxazolidin-2-one

(2S,4S)-4-(tert-Butyl-dimethyl-silanyloxy)-4-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2-methyl-butan-1-ol

(1S,3S)-1-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-3-methyl-4-(2-methyl-[1,3]dithian-2-yl)-butan-1-ol

(S)-4-Benzyl-3-[(S)-4-(tert-butyl-dimethyl-silanyloxy)-4-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-butyryl]-oxazolidin-2-one

(S)-4-Benzyl-3-[(2S,4S)-4-(tert-butyl-dimethyl-silanyloxy)-4-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2-methyl-butyryl]-oxazolidin-2-one