1 the antinociceptive activities of morphine , codeine and dextropropoxyphene ( micro-agonists ) , buprenorphine and mr 2034 [ ( - ) 5,9-dimethyl-2- ( tetrahydrofurfuryl ) -2'-hydroxy-6,7-benzomorphan ] ( k-agonists ) have been determined against nociceptive responses to electrical stimulation of the tooth pulp in the conscious dog .
C0026549
morphine
C0009214
codeine