The Collaborative International Dictionary of English v.0.48:

Atabrine \Atabrine\ n. [Trademark.]
   a drug once used to treat malaria (C23H30ClN3O); chemically
   it is a derivative of the tricyclic structure acridine:

   6-chloro-9-[[4-(diethylamino-1-methylbutyl)]amino]-2-methoxyacridine.
   It also has some anthelmintic activity against cestodes.
   Atabrine is a trademark.

   Syn: quinacrine, mepacrine.
        [WordNet 1.5]