2-苄基-4-氧代-3,4-二氢吡啶-1(2H)-羧酸苄酯

4-氧代-2-丙基-3,4-二氢吡啶-1(2H)-羧酸苄酯

benzyl 2-ethyl-4-oxo-2,3-dihydropyridine-1-carboxylate

2-哌啶甲酸

N-甲基吡咯烷酮