methyl (3R,4S)-3-butylamino-4,5-(isopropylidenedioxy)pentanoate

(S)-3-(tert-Butyl-dimethyl-silanyloxy)-4-phenyl-butyraldehyde

methyl (3R)-3-[(tert-butoxycarbonyl)amino]-3-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]propanoate

((S)-1-Benzyl-3-benzyloxy-propoxy)-tert-butyl-dimethyl-silane

[(R)-4-tert-Butoxycarbonylamino-4-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2-oxo-butyl]-phosphonic acid dimethyl ester