the rank order of potency : neca ( 5'- ( n-ethylcarboxamido ) -adenosine , ec50 0.2 microm ) greater than adenosine ( 0.71 microm ) = 2-chloroadenosine ( 0.72 microm ) greater than l-pia ( n6- ( l-phenylisopropyl ) -adenosine , 1.03 microm ) greater than d-pia ( n6- ( d-phenylisopropyl ) -adenosine , 5.27 microm ) is consistent with that for agonism at activatory ( ra-site ) adenosine receptors in other tissues .
C0000275
2-chloroadenosine
C0001443
adenosine