PPB

N,N'-BIS(PHENANTHREN-9-YL)-N,N'-DIPHENYLBENZIDINE

N,N'-bis-(Phenanthren-9-yl)-N,N'-bisphenyl benzidine

N,N′-Di-[(9-phenanthrenyl)-N,N′-diphenyl]-1,1′-biphenyl-4,4′-diamine