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