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