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