8-phenyltheophylline was an apparently competitive antagonist of the negative chronotropic effect of adenosine , 2-chloroadenosine , l-n6-phenyl-isopropyl adenosine ( l-pia ) and 5'-n-ethylcarboxamide adenosine ( neca ) on atria and of the relaxant effect of adenosine , 2-chloroadenosine and neca on the aorta .
C0050789
5
C0001443
neca