3-hydroxy-4,4-dimethyl-pentanoic acid ethyl ester

4-t-butyl-5-hydroxymethyl-1,3-dioxol-2-one

benzyl 5-t-butyl-1,3-dioxolene-2-one-4-carboxylate

4-bromomethyl-2-methoxymethyl-5-tert-butylisoxazolin-3-one

2-chloro-4,4-dimethyl-3-oxopentanoic acid ethyl ester