41867-20-3
ethyl 3-aminocrotonate
→
33831-56-0
ethyl 4-hydroxy-2,6-dimethylpyridin-3-carboxylate
70271-80-6
4-氯-2,6-二甲基吡啶-3-羧酸乙酯
33259-21-1
4-羟基-2,6-二甲基烟酸