Indolizine
Indolizine is an heterocyclic compound with the formula C8H7N). It is an uncommon isomer of indole with the nitrogen located at a ring fusion position. The Saturated and [unsaturated compounds|saturated] analog is indolizidine, which is the core of a variety of alkaloids such as swainsonine.
Examples of some simple fully synthetic substituted indolizines include 2ZEDMA, 1ZP2MA, and 1Z2MAP1O.