all the purines tested reduced the positive inotropic action of isoprenaline , 0.1 microm , with the potency order : l-n6-phenlylisopropyladenosine ( l-pia ) greater than 5'-n-ethylcarboxamide adenosine ( neca ) greater than d-pia greater than 2-chloroadenosine greater than adenosine .
C0050789
5
C0001443
adenosine