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