Methyl 2-methyl-6-nitro-4-(trifluoromethoxy)pyridine-3-acetate
3-(Difluoromethyl)-5-nitro-2-(trifluoromethoxy)pyridine-4-carboxylic acid
2-(Difluoromethyl)-6-nitro-3-(trifluoromethoxy)pyridine-4-carboxylic acid
2-(Difluoromethyl)-5-nitro-3-(trifluoromethoxy)pyridine-4-carboxylic acid