Azocine
Azocine is a heterocyclic organic compound with the molecular formula C7H7N. It consists of an unsaturated eight-membered ring having seven carbon atoms, one nitrogen atom and four double bonds.
Saturated or partially saturated azocine rings form the core structure of a group of opioid compounds sometimes known as azocines. These include cyclazocine, pentazocine, and phenazocine.