Synonyms: o-Phenylenediamine,4,4'-methylenebis- (7CI,8CI); 3,3',4,4'-Tetraaminodiphenylmethane;3,3',4,4'-Tetraminodiphenylmethane; 3,4,3',4'-Tetraminodiphenylmethane;4,4'-Ethylenedi-o-phenylenediamine; 4,4'-Methylenebis(o-phenylenediamine);Bis(3,4-diaminophenyl)methane