nanomolar concentrations of the a1 receptor agonists , cyclohexyladenosine ( cha ) and phenylisopropyladenosine ( pia ) , significantly inhibited the activity of forskolin-stimulated adenylate cyclase in preparations in which endogenous adenosine was destroyed by pretreatment with adenosine deaminase .
C0031484
phenylisopropyladenosine
C0001443
preparations