methyl 1-methyl-4-phenyl-4H-pyridine-3-carboxylate

methyl 1-methyl-2-phenyl-2H-pyridine-5-carboxylate

1-甲基-4H-吡啶-3-羧酸

1-甲基-3-哌啶甲酸甲酯

1-methylpyridin-1-ium-3-carboxylic acid