benzidine(1,1'-biphenyl)-4,4'-diamine4,4'-bianiline4,4'-biphenyldiamine4,4'-biphenylenediamine4,4'-diamino-1,1'-biphenyl4,4'-diaminobiphenyl4,4'-diaminodiphenyl4,4'-diphenylenediamineC.I. azoic diazo component 112p,p'-bianilinep,p'-diaminodiphenylp-diaminodiphenyl