5-benzyloxy-6-methyl-pyridine-3,4-dicarboxylic acid dibenzyl ester

3-氰基-1,2-二氢-6-甲基-2-氧代-4-吡啶羧酸乙酯

2-氯-3-氰基-6-甲基-5-硝基异烟酸乙酯

ethyl 5-cyano-2-methyl-3-nitro-6-oxo-1H-pyridine-4-carboxylate

乙酰丙酮酸乙酯