for comparison , sk & f 94120 , theophylline and 3-isobutyl-1-methyl-xanthine ( ibmx ) were examined as phosphodiesterase inhibitors whilst n6-cyclohexyladenosine , r ( - ) -n6- ( 2-phenylisopropyl ) -adenosine , 5'-n-ethylcarboxamido-adenosine , 2-nitrobenzylthioinosine , theophylline and ibmx were examined for their affinity for adenosine binding sites .
C0050789
5
C0001443
adenosine