1(2H)-NAPHTHALENONE, 3,4-DIHYDRO-2-(2-PYRIDYLMETHYLENE)- 13640-50-1 2-(2-Pyridylmethylene)-3,4-dihydro-1(2H)-naphthalenone 5-21-09-00177 (Beilstein Handbook Reference) BRN 1461621 NSC 270711