the neca was the most potent of the compounds in reducing blood pressure ( ec50 2 micrograms kg-1 i.v . ) , followed by l-pia ( ec50 approximately 30 micrograms kg-1 i.v . ) and adenosine ( ec50 approximately 300 micrograms kg-1 i.v . ) .
C0050789
neca
C0001443
adenosine