the distribution of binding sites for the a1 selective agonist , n6- [ 3h ] - [ ( r ) -1-methyl-2-phenylethyl ] adenosine ( r- [ 3h ] pia ) , was similar to the distribution of binding sites for [ 3h ] -5'-n-ethylcarboxamide adenosine [ ( 3h ] neca ) , an agonist that binds to a1 and a2 receptors with nearly equal affinities .
C0001443
adenosine
C0050789
neca