A poisonous organic base (a ptomaine) formed in the
   decomposition of protagon with boiling baryta water, and in the
   putrefraction 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.