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