3-Amino-5-nitro-6-(trifluoromethoxy)pyridine-2-carboxylic acid
2-Amino-4-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-acetic acid
3-Amino-5-nitro-2-(trifluoromethoxy)pyridine-6-carboxylic acid
3-Amino-4-nitro-6-(trifluoromethoxy)pyridine-2-carboxylic acid