Synonyms: Bromochlorophenolblue (6CI); Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis[2-bromo-6-chloro-,S,S-dioxide (8CI); o-Toluenesulfonic acid, a,a-bis(3-bromo-5-chloro-4-hydroxyphenyl)-a-hydroxy-, g-sultone (7CI); 3H-2,1-Benzoxathiole, phenol deriv.;Bromchlorophenol blue; NSC 7816