Synonyms: 2,2'-Biphenyldiol,3,3',5,5'-tetrabromo- (8CI); o,o'-Biphenol, 4,4',6,6'-tetrabromo- (6CI,7CI);2,2'-Dihydroxy-3,3',5,5'-tetrabromobiphenyl;3,3',5,5'-Tetrabromo-1,1'-biphenyl-2,2'-diol;3,3',5,5'-Tetrabromo-2,2'-dihydroxybiphenyl;3,5,3',5'-Tetrabromo-2,2'-dihydroxybiphenyl; Bromophene; Dephosphatebromofenofos; MC 21A