<prompt> All are opioid agonist - antagonist compounds except a Buprenorphineb Nalbuphinec Pentazocined Nalmefenee Papaverineabbccdde  <response>: Agonist antagonist opioids Pentazocine, Nalbuphine, Nalorphine, Butorphanol, Levallorphan, Dezocine, Meptazinol, Buprenorphine. 