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