O-Desmethyl-cis-Tramadol

O-Desmethyl-cis-Tramadol

O-Desmethyltramadol is an opioid analgesic and an active primary blood metabolite of the synthetic analgesic tramadol. O-Desmethyltramadol is the active component in the designer drug “Krypton”, which is marketed in many countries as a legal high.