Bromothymol Blue

4,4′-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-bromothymol) S,S-dioxide; C₂₇H₂₈Br₂O₅S = 624 (76-59-5)

Reddish-pink or brownish powder, practically insoluble in water, soluble in ethanol (96%) and in dilute solutions of alkali hydroxides.