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