6-(Difluoromethyl)-3-methoxy-2-nitropyridine-4-carboxaldehyde
2-(Difluoromethyl)-5-methoxy-4-nitropyridine-3-carboxaldehyde
2-(Difluoromethyl)-5-methoxy-3-nitropyridine-4-carboxaldehyde
2-(Difluoromethyl)-3-methoxy-5-nitro-6-(trifluoromethyl)pyridine