the discriminative effects of 10 mg/kg of caffeine were blocked dose-dependently and completely by alpha adrenergic receptor blocking drugs ( phentolamine , prazosin and yohimbine ) and were blocked partially by propranolol and by drugs having behavioral depressant properties ( diazepam , pentobarbital and the adenosine analogs , r- ( - ) -n6- ( 2-phenylisopropyl ) adenosine , cyclohexyladenosine , 2-chloroadenosine ) .
C0001443
adenosine
C0000275
2-chloroadenosine