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