Ethyl 2-cyano-6-(difluoromethyl)-4-hydroxypyridine-3-carboxylate
Ethyl 6-cyano-4-(difluoromethyl)-2-hydroxypyridine-3-carboxylate
2-Cyano-6-(difluoromethyl)-3-fluoropyridine-5-acetonitrile
Ethyl 2-cyano-3-(difluoromethyl)-5-hydroxypyridine-4-carboxylate