5-(Difluoromethyl)-4-nitro-3-(trifluoromethoxy)pyridine-2-carboxamide
3-(Difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine-6-carboxamide
3-(Difluoromethyl)-2-nitro-4-(trifluoromethoxy)pyridine-5-carboxamide
2-(Difluoromethyl)-6-nitro-4-(trifluoromethoxy)pyridine-3-carboxamide