Ethyl 4-(difluoromethyl)-3-hydroxy-2-nitropyridine-6-carboxylate
Methyl 3-(difluoromethyl)-6-hydroxy-2-nitropyridine-5-acetate
Methyl 3-(difluoromethyl)-5-hydroxy-6-nitropyridine-2-acetate
2-(Chloromethyl)-3-(difluoromethyl)-4-hydroxypyridine-6-acetic acid