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