The Collaborative International Dictionary of English v.0.48:

Cotarnine \Co*tar"nine\ (k?-t?r"n?n or -n?n), n. [F., fr.
   narcotine, by transposition of letters.] (Chem.)
   A white, crystalline substance, C12H13NO3, obtained as a
   product of the decomposition of narcotine. It has weak basic
   properties, and is usually regarded as an alkaloid.
   [1913 Webster]