n-ethylcarboxamidoadenosine ( neca ) , a nonspecific adenosine selective agonist , was a much more potent vasodilator than two relatively selective a1 adenosine agonists , n6-cyclopentyladenosine and n6-phenylisopropyladenosine , suggesting that a2 receptors are involved .
C0050789
n-ethylcarboxamidoadenosine
C0001443
adenosine