.beta.-Naphthoflavone 1H-Naphtho[2,1-b]pyran-1-one, 3-phenyl- 3-Phenyl-1H-naphtho[2,1-b]pyran-1-one 5,6-Benzoflavone 6051-87-2 NSC136015 WLN: T B666 CV FOJ ER