2-ChloroadenosineAdenosineAdenosine-5'-(N-ethylcarboxamide)Receptors, PurinergicReceptors, Purinergic P1Purinergic P1 Receptor AntagonistsPhenylisopropyladenosineXanthinesPurinergic P1 Receptor AgonistsTheophylline8-Bromo Cyclic Adenosine MonophosphatePhenethylaminesReceptor, Adenosine A2BAdenosine DeaminaseDipyridamolePyran CopolymerPurinergic AntagonistsTubercidinCyclic AMPAdenosine KinaseReceptor, Adenosine A2AMuscarineGuinea Pigs