2-ChloroadenosineAdenosineReceptors, PurinergicAdenosine-5'-(N-ethylcarboxamide)XanthinesReceptors, Purinergic P1PhenylisopropyladenosinePurinergic P1 Receptor AntagonistsTheophyllinePurinergic P1 Receptor Agonists8-Bromo Cyclic Adenosine MonophosphatePhenethylaminesReceptor, Adenosine A2BAdenosine DeaminasePyran CopolymerDipyridamolePurinergic AntagonistsTubercidinAdenosine KinaseCyclic AMPReceptor, Adenosine A2AMuscarineGuinea Pigs