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