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

[(1R,3S,7R)-7-(tert-Butyl-dimethyl-silanyloxy)-1-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-3-hydroxy-8-phenyl-octyl]-carbamic acid tert-butyl ester

(R)-3-(tert-Butoxycarbonylmethyl-amino)-3-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-propionic acid methyl ester

[(R)-1-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-3-oxo-3-thiophen-2-yl-propyl]-carbamic acid tert-butyl ester

[(R)-1-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-3-oxo-3-pyridin-2-yl-propyl]-carbamic acid tert-butyl ester