Synonyms: 3,3'-Biphenyldialanine,6,6'-dihydroxy- (6CI,7CI); 3,3'-Biphenyldipropionic acid, a,a'-diamino-6,6'-dihydroxy- (8CI);[1,1'-Biphenyl]-3,3'-dipropanoic acid, a,a'-diamino-6,6'-dihydroxy- (9CI); 3,3'-Bityrosine; 3,3'-Dityrosine;Bityrosine; Dityrosine; o,o-Dityrosine; o,o'-Dityrosine