2,6-dimethyl-4-[(4-nitrophenyl)hydrazinylidene]cyclohexa-2,5-dien-1-one

3-ethyl-2-methylpent-2-enoic acid

2-methyl-1-phenylpentane-1,3-dione

ethyl 3-ethylpent-2-enoate

ethyl-3-ethyl-pent-3-enoate