C6H2Br3OH

from The Collaborative International Dictionary of English v.0.48

Bromol \Bro"mol\, n. [Abbr. fr. tribromophenol.] (Pharm.)
   A crystalline substance (chemically, tribromophenol,
   {C6H2Br3OH}), used as an antiseptic and disinfectant.
   [Webster 1913 Suppl.]