the adenosine analogs [ 5'-n-ethylcarboxamideadenosine ( neca ) , 2-chloro-adenosine ( 2-cla ) , r-phenylisopropyladenosine ( r-pia ) , n6-cyclohexyl adenosine ( cha ) , and n6-cyclopentyladenosine ( cpa ) ] produced both relaxation and contraction responses in isolated guinea-pig trachea .
C0001443
adenosine
C0031484
phenylisopropyladenosine