Amanullinic acid

Amanullinic acid is a cyclic nonribosomal peptide. It is an amatoxin, all of which are found in several members of the mushroom genus "Amanita". Amanullinic acid is relatively non-toxic( oral >20 mg/kg in mice).
Toxicology.
Like other amatoxins, amanullinic acid is an inhibitor of RNA polymerase II.