the adenosine uptake inhibitors are the most potent inhibitors of binding ( ki of 10 ( -8 ) -10 ( -7 ) m ) whereas adenosine receptor ligands such as cyclohexyladenosine , 2-chloroadenosine , and various methylxanthines are several orders of magnitude less potent ( ki 10 ( -5 ) -10 ( -2 ) .
C0001443
adenosine
C0000275
2-chloroadenosine