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