All are opioid agonist - antagonist compounds except – a) Buprenorphineb) Nalbuphinec) Pentazocined) Nalmefenee) Papaverine
High-Yield Explanation
Agonist antagonist opioids Pentazocine, Nalbuphine, Nalorphine, Butorphanol, Levallorphan, Dezocine, Meptazinol, Buprenorphine.