NALORPHINES

a synthetic opioid similar to morphine in chemical structure, which acts as a mixed opioid antagonist and agonist and formerly was used in the diagnosis and treatment of narcotic abuse and overdosage; (−)-(5 r,6 s)-9a-allyl-4,5-epoxymorphin-7-en-3,6-diol, c₁₉ h₂₁ no₃.