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