The Collaborative International Dictionary of English v.0.48:

Neurine \Neu"rine\ (? or ?), n. [Gr. ney^ron a nerve.] (Physiol.
   Chem.)
   A poisonous organic base (a ptomaine) formed in the
   decomposition of protagon with boiling baryta water, and in
   the putrefaction of proteid matter. It was for a long time
   considered identical with choline, a crystalline body
   originally obtained from bile. Chemically, however, choline
   is oxyethyl-trimethyl-ammonium hydroxide, while neurine is
   vinyl-trimethyl-ammonium hydroxide. [Written also neurin.]
   [1913 Webster]