the r ( - ) - and s ( + ) -enantiomers of n6- ( 2-phenylisopropyl ) adenosine ( r-pia and s-pia respectively ) , n6-cyclohexyladenosine ( cha ) and 2-chloroadenosine ( cado ) caused contractions at low concentrations ( 0.05-2.0 microm ) , whereas at higher concentrations , relaxation resulted .
C0001443
adenosine
C0000275
2-chloroadenosine