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