2-hydroxy-6-methyl-pyridine-3,5-dicarboxylic acid

2-甲基-6-氧代-1-2,6-二氢-3-羧酸乙酯

2-甲基-6-氧代-1,4,5,6-四氢吡啶-3-羧酸乙酯

6-氯-2-甲基烟酸乙酯

2-氨基-6-甲基吡啶