|Systematic (IUPAC) name|
|Mol. mass||297.434 g/mol|
Cyclorphan is a hallucinogenic opioid mixed agonist–antagonist related to levorphanol discovered in the late 1960s. It is not marketed as an analgesic because of side effects related to its impact on the kappa opioid receptor, but has found some use as a research chemical on and off since its discovery.