4-Hydroxy-3-methyl-6-(trifluoromethoxy)pyridine-2-acetic acid
4-Hydroxy-3-methyl-2-(trifluoromethoxy)pyridine-6-acetic acid
4-(Fluoromethyl)-5-hydroxy-3-(trifluoromethoxy)pyridine-2-methanol
3-(Fluoromethyl)-2-hydroxy-4-(trifluoromethoxy)pyridine-6-acetic acid