N-hydroxy-1-methylpyridin-1-ium-3-carboxamide

乙基beta-乙氧羰基-gamma-氧代-3-吡啶丁酸酯

4-methylbenzenesulfonate,1-methylpyridin-1-ium-3-carbohydrazide

4-甲基烟酸乙酯

ethyl 1-(2-fluoroethyl)pyridin-1-ium-3-carboxylate,bromide