CBr3.COH

from The Collaborative International Dictionary of English v.0.48

Bromal \Bro"mal\ (br[=o]"mal), n. [Bromine + aldehyde.] (Chem.)
   An oily, colorless fluid, {CBr3.COH}, related to bromoform,
   as chloral is to chloroform, and obtained by the action of
   bromine on alcohol.
   [1913 Webster]