Ethyl 5-(difluoromethyl)-4-fluoro-3-(trifluoromethoxy)pyridine-2-carboxylate
4-(Fluoromethyl)-2-hydroxy-3-(trifluoromethoxy)pyridine-5-acetic acid
5-(Fluoromethyl)-3-hydroxy-4-(trifluoromethoxy)pyridine-2-acetic acid
3-(Fluoromethyl)-5-hydroxy-2-(trifluoromethoxy)pyridine-4-acetic acid