cgs 21680c ( 2- [ p- ( 2-carboxyethyl ) phenethylamino ] -5'-n-ethyl-carboxamido adenosine ) a 2-substituted analog of the riboside uronamide , 5'-n-ethylcarboxamido adenosine and the related analog cgs 21577 ( 2-phenethylamino-5'-n-ethylcarboxamido adenosine ) , have high in vitro affinity for brain striatal adenosine a2 receptors ( ic50 values = 22 and 13 nm , respectively ) .
C0001443
adenosine
C0050789
5