comparing the relative potencies of compounds such as adenosine , 2-chloroadenosine , 5'- ( n-ethylcarboxamido ) adenosine , and ( - ) n6- ( r-phenylisopropyl ) adenosine , which have been used widely to classify adenylate cyclase-coupled adenosine receptors , no uniform pattern became apparent among different smooth muscle systems used in this study and reported in the recent literature .
C0000275
2-chloroadenosine
C0001443
adenosine