5-Chloropyridine-2-boronic acid652148-91-930 % similar 2-Cyano-5-hydroxypyridine86869-14-930 % similar 5-Bromo-2-pyridinecarbonitrile97483-77-730 % similar 2-Cyanopyridine100-70-930 % similar 2-Chlorobenzonitrile873-32-530 % similar