5-isopropyl-1,2,4-oxadiazol-3-amine

diethyl 2,2,6,6-tetramethylheptanedioate

3-benzyl-5,5-dimethyltriazol-4-one

ethyl 3-hydroxy-2,2-dimethylpent-4-enoate

ethyl 2,2-dimethyl-3-oxopent-4-enoate