3-Fluoro-5-hydroxy-2-(trifluoromethoxy)pyridine-4-carboxylic acid
3-(Fluoromethyl)-2-hydroxy-6-methoxy-5-(trifluoromethoxy)pyridine
4-(Difluoromethyl)-2-fluoro-3-(trifluoromethoxy)pyridine-6-acetic acid
3-(Difluoromethyl)-5-fluoro-6-(trifluoromethoxy)pyridine-2-acetic acid