the effect of isoproterenol ( 0.1 microm ) was inhibited by various adenosine derivatives , the rank order of potency being in the rat : ( - ) -n6- ( r-phenyl-isopropyl ) -adenosine ( r-pia ) greater than 5'-n-ethylcarboxamidoadenosine ( neca ) greater than s-pia , and in the dog neca greater than r-pia greater than s-pia .
C0001443
adenosine
C0050789
neca