selective ligands for mu , sigma , delta and epsilon opioid binding sites were poor inhibitors for inhibiting [ 3h ] ethylketocyclazocine binding to this site , whereas kappa opioids like oxilorphan , dynorphin ( 1-13 ) , ethylketocyclazocine , butorphanol , cyclazocine , ketocyclazocine , tifluadom , nalorphine , pentazocine , u-50-488 , nalbuphine and naloxone were potent ligands .
C0079314
ethylketocyclazocine
C0010526
cyclazocine