Methyl 4-cyano-3-(difluoromethyl)-2-fluoropyridine-5-carboxylate
Methyl 4-cyano-2-(difluoromethyl)-3-fluoropyridine-5-carboxylate
Methyl 2-cyano-6-(difluoromethyl)-3-fluoropyridine-4-carboxylate
2-Cyano-4-(difluoromethyl)-3-fluoropyridine-5-acetic acid