The Collaborative International Dictionary of English v.0.48:

butacaine \butacaine\ n.
   a white crystalline ester (C18H30N2O2) that is applied to
   mucous membranes as a topical anesthetic. Chemically it is
   3-(di-n-butylamino)-1-propanol 4-aminobenzoate
   (H2N.C6H4.CO.O.(CH2)3N(C4H9)2). It is usually used as the
   sulfate salt.

   Syn: butacaine sulfate.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

butacaine
    n 1: a white crystalline ester that is applied to mucous
         membranes as a local anesthetic [syn: butacaine,
         butacaine sulfate]