5-Cyano-2-(difluoromethyl)-4-(trifluoromethyl)pyridine-3-acetic acid
4-(Bromomethyl)-3-cyano-5-(difluoromethyl)pyridine-2-acetic acid
3-(Bromomethyl)-4-cyano-5-(difluoromethyl)pyridine-2-acetic acid
2-(Bromomethyl)-4-cyano-5-(difluoromethyl)pyridine-3-acetic acid