Ethyl 5-bromo-2-cyano-3-(trifluoromethoxy)pyridine-6-carboxylate
Ethyl 3-bromo-4-cyano-2-(trifluoromethoxy)pyridine-6-carboxylate
4-Amino-6-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-acetic acid
4-Amino-2-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-acetic acid