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