5-methyl-5-phenylsulfanylhexan-2-one

2,2,3,3-Tetramethyl-4-methylen-cyclobutanon

2,2-dimethyl-4-hexynoic acid methyl ester

3,3-Dimethyl-1-isopropyliden-cyclobutanon-(2)

2-methyl-(3-methyl-3-phenylthiobutyl)-1,3-dioxolane