2-ethyl-2,3,3-trimethylcyclobutan-1-one

3-ethyl-3,5,5-trimethylheptan-4-one

N-butyl-2-methyl-N-(4-methyl-1,3-oxazol-2-yl)butanamide

3,3-diethyl-5,5-dimethylheptan-4-one

2-chloro-2-methylbutanoyl chloride