3-溴-4-氧代戊酸乙酯

4-(3-methyl-6-oxo-4,5-dihydropyridazin-1-yl)benzoic acid

ethyl (4Z)-4-[(2,4-dinitrophenyl)hydrazinylidene]pentanoate

5-氯-5-甲基二氢-2(3H)-呋喃酮

octyl 4-oxopentanoate