.beta.,.beta.-Binaphthyleneethene 1,2,7,8-Dibenzphenanthrene 1,2:7,8-Dibenzophenanthrene 213-46-7 3,4-Benzchrysene Benzo[a]chrysene Dibenzo[a,i]phenanthrene NSC406006 Picene Pycene WLN: L F6 E6 B666J