HC2H5SO4

Ethylsulphuric Eth`yl*sul*phu"rica. (Chem.) Pertaining to, or containing, ethyl and sulphuric acid. [1913 Webster]

{Ethylsulphuric acid} (Chem.), an acid sulphate of ethyl, {H.C2H5.SO4}, produced as a thick liquid by the action of sulphiric acid on alcohol. It appears to be the active catalytic agent in the process of etherification. [1913 Webster]