the effects of acetylcholine and carbachol in cat atrial heart muscle were mimicked , qualitatively , by adenosine and its analogues 5'- ( n-ethyl ) -carboxamido-adenosine ( neca ) and ( - ) -n6- ( r-phenyl-isopropyl ) -adenosine ( r-pia ) .
C0050789
neca
C0001443
adenosine