Noun
English Wikipedia has an article on:alpha-amanitinWikipedia
amanitin (plural amanitins)
(biochemistry) A deadly amatoxin found in Amanita phalloides (the death cap), the four destroying angels (Amanita bisporigera, Amanita ocreata, Amanita verna, and Amanita virosa), and some other amanitas.