Synonyms: 1,2-Benzenediamine,N,N''-1,2-ethanediylbis- (9CI); o-Phenylenediamine, N,N''-ethylenebis-(6CI,8CI); 1,2-Bis(o-aminophenylamino)ethane; 1,2-Di(o-aminophenylamino)ethane;N,N'-Bis(2-aminophenyl)ethylenediamine;N,N'-Bis(o-aminophenyl)-1,2-diaminoethane