2,3,4-trimethyl-1,2-oxazol-5-one

4-methyl-5-oxohexanoic acid

methyl 2-methyl-3-oxo-2-phenylsulfanylbutanoate

3,4-Dimethyl-1H-pyrazol-5-ol

methyl 2-acetyl-5-chloro-2-methylpentanoate