Methyl 6-(aminomethyl)-4-(difluoromethyl)-3-hydroxypyridine-2-carboxylate
3-(Bromomethyl)-4-(difluoromethyl)-2-hydroxy-5-nitropyridine
Ethyl 2-(difluoromethyl)-3-hydroxy-5-methylpyridine-4-acetate
4-(Difluoromethyl)-6-hydroxy-2-nitro-3-(trifluoromethyl)pyridine