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