7-methoxymethoxy-2,2-dimethyl-4-methylene-5-tert-butyldimethylsilyloxy-(3aR,5S,7S,7aS)-perhydrobenzo[d][1,3]dioxole

1-[5-(1-ethynyl)-2,2-dimethyl-(4S,5R)-1,3-dioxolan-4-yl]-3-triphenylmethyloxy-(1S)-propan-1-ol

4-[1-tert-butyldimethylsilyloxy-3-triphenylmethyloxy-(1S)-propyl]-5-(1-ethynyl-2,2-dimethyl)-(4R,5R)-1,3-dioxolane