the coronary vasoactivity of n-ethyl-1'-deoxy-1'- ( 6-amino-9h-purin-9-yl ) -beta-d-ribofuranuronamide ( neca , 1 ) is over 2 orders of magnitude greater than that of adenosine , and the vasoactivity of certain n6-substituted adenosines is as much as 1 order of magnitude greater .
C0050789
neca
C0001443
adenosines