Synonyms: Phenol,2,2'-azobis- (9CI); Phenol, 2,2'-azodi- (6CI,7CI,8CI); Phenol, o,o'-azobis-(3CI); Phenol, o,o'-azodi- (4CI); 2,2'-Azodiphenol; 2,2'-Azophenol;2,2'-Diazenediyldiphenol; 2,2'-Dihydroxyazobenzene; Azobenzene-2,2'-diol;Azobis(2-hydroxyphenyl); o,o'-Dihydroxyazobenzene; o-Azophenol