Pyrrolizidine
Pyrrolizidine is a heterocyclic organic compound. Formally, it is a Saturated and [unsaturated compounds|saturated] derivative of pyrrolizine.
Pyrrolizidine forms the central chemical structure of a variety of alkaloids known collectively as pyrrolizidine alkaloids. It is one of five classes of iminosugars. These are often synthesized from a carbohydrate.