615-79-2
乙酰丙酮酸乙酯
→
5427-92-9
ethyl 5-cyano-2-methyl-3-nitro-6-oxo-1H-pyridine-4-carboxylate
18619-97-1
3-氰基-1,2-二氢-6-甲基-2-氧代-4-吡啶羧酸乙酯