Methyl 2-(difluoromethyl)-3-hydroxy-4-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 4-(difluoromethyl)-3-hydroxy-2-(trifluoromethoxy)pyridine-6-carboxylate
6-Hydroxy-4-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-3-acetic acid
3-(Difluoromethyl)-2-hydroxy-5-(trifluoromethoxy)pyridine-6-acetic acid