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