(S)-5-(tert-Butyl-diphenyl-silanyloxy)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-pent-2-ynoic acid ethyl ester

Acetic acid (S)-1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-but-3-ynyl ester

1-[2',2'-dimethyl-(4'R)-1',3'-dioxolan-4'-yl]-(1S)-3-butyn-1-ol