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