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