all six analogs of adenosine produced dose-related decreases in fr responding with the following order of potency : 5 ' n-ethylcarboxamide adenosine ( neca ) greater than 2-chloroadenosine ( 2-ca ) greater than n6-r-phenylisopropyladenosine ( r-pia ) greater than n6-cyclopentyladenosine ( cpa ) greater than n6-cyclohexyladenosine ( cha ) greater than n6-s-phenylisopropyladenosine ( s-pia ) .
C0001443
adenosine
C0031484
phenylisopropyladenosine