2 concentration-response curves to adenosine and a number of 5'- and n6-substituted analogues were constructed and the order of potency of the purines was : 5'-n-cyclopropylcarboxamide adenosine ( ncpca ) = 5'-n-ethylcarboxamide adenosine ( neca ) greater than n6cyclohexyladenosine ( cha ) greater than l-n6-phenylisopropyl adenosine ( l-pia ) = 2-chloroadenosine- greater than adenosine greater than d-n6-phenylisopropyl adenosine ( d-pia ) .
C0000275
2-chloroadenosine
C0001443
adenosine