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