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