the pure opioid antagonists , naloxone , naltrexone , and win 44,441-3 [ ( 2-alpha-6 alpha , 11s ) - ( - ) -1-cyclopentyl-5- ( 1,2,3,4,5,6-hexahydro-8-hydroxy-3,6,11-trim eth yl-2 , 6-metheno-3-benzazocin-11-yl ) -3-pentanone ] occasioned responding primarily on the lever appropriate for vehicle .
C0027358
naloxone
C0027360
naltrexone