2-ChloroadenosineAdenosineReceptors, PurinergicAdenosine-5'-(N-ethylcarboxamide)XanthinesReceptors, Purinergic P1TheophyllinePhenylisopropyladenosinePurinergic P1 Receptor AntagonistsPurinergic P1 Receptor Agonists8-Bromo Cyclic Adenosine MonophosphateCyclic AMPPhenethylaminesReceptor, Adenosine A2BAdenosine DeaminaseDipyridamolePyran CopolymerPurinergic AntagonistsTubercidinAdenosine KinaseReceptor, Adenosine A2AGuinea PigsAdenylate CyclaseAdenineMuscarinePurinesColforsinAdenosine TriphosphateDose-Response Relationship, Drug