agonists compete for [ 125i ] n6- [ 2- ( 4-amino-3-iodophenyl ) ethyl ] -adenosine ( a1 receptor-selective radioligand ) binding with the following potency series : ( r ) -phenylisopropyladenosine [ ( r ) -pia ] greater than 5'-n-ethylcarboxamide adenosine ( neca ) greater than ( s ) -pia , indicative of their interaction with a1 adenosine receptors .
C0001443
adenosine
C0031484
phenylisopropyladenosine