Although cyclopyrrolones are chemically unrelated to benzodiazepines, they function via the benzodiazepine receptor/GABAneurotransmitter. The best known cyclopyrrolone derivatives are zopiclone (Imovane) and its enantiomereszopiclone (Lunesta), which are used to treat insomnia, and have a known potential for abuse. Other cyclopyrrolone derivatives include suriclone, pagoclone, pazinaclone and suproclone.