531-85-1 Benzidine dihydrochloride Benzidine hydrochloride Benzidine, dihydrochloride Dihidrocloruro de benzidina NSC3500 WLN: ZR DR DZ &GH 2 [1,1'-Biphenyl]-4,4'-diamine dihydrochloride [1,1'-Biphenyl]-4,4'-diamine, dihydrochloride [1,1-Biphenyl]-4,4'-diamine, dihydrochloride