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