4-butyl-1-ethoxycarbonyl-3-methoxycarbonyl-1,4-dihydropyridine

methyl 4-phenylpyridine-3-carboxylate

methyl 1-benzylpyridin-1-ium-3-carboxylate,chloride

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

methyl 6-ethoxynicotinate