Methyl 4-fluoro-2-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 3-(difluoromethyl)-2-methyl-5-(trifluoromethoxy)pyridine-4-carboxylate
Methyl 3-fluoro-4-(trifluoromethoxy)pyridine-5-carboxylate
Methyl 6-(difluoromethyl)-2-methyl-3-(trifluoromethoxy)pyridine-4-carboxylate