4-Amino-6-(difluoromethyl)-3-(trifluoromethoxy)pyridine-2-acetic acid
4-Amino-2-(difluoromethyl)-3-(trifluoromethoxy)pyridine-5-acetic acid
3-Amino-2-(difluoromethyl)-4-(trifluoromethoxy)pyridine-5-acetic acid
3-Bromo-6-cyano-4-(trifluoromethoxy)pyridine-2-acetic acid