AP-238 is an opioid designer drug related to drugs such as azaprocin and bucinnazine, with around the same potency as morphine. It was first discovered in Italy in the 1960s but was never marketed, subsequently appearing on the illicit market around 2020 and being detected in both Slovenia and the USA.
See also 2F-Viminol Diphenpipenol Dipyanone Etodesnitazene MT-45 Nortilidine O-AMKD O-DSMT Piperidylthiambutene SHR9352
References