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