(-)-(1S,2S)-methyl (2-isopropenylcyclopropyl)acetate

(-)-(1S,3S)-methyl (2,2-dimethyl-3-((p-toluenesulfonyl)oxy)cyclobutyl)acetate

2-[(1S,3S)-2,2-Dimethyl-3-(2-methyl-[1,3]dioxolan-2-yl)-cyclobutyl]-ethanol

[(1S,3S)-2,2-Dimethyl-3-(2-methyl-[1,3]dioxolan-2-yl)-cyclobutyl]-acetaldehyde

(Z)-2-Benzyloxycarbonylamino-4-[(1R,3S)-2,2-dimethyl-3-(2-methyl-[1,3]dioxolan-2-yl)-cyclobutyl]-but-2-enoic acid methyl ester