three adenosine analogues n6- ( l-2-phenylisopropyl ) adenosine ( r-pia ) , n6- ( d-2-phenylisopropyl ) adenosine ( s-pia ) , and 5'- ( n-ethylcarboxamido ) adenosine ( neca ) with different adenosine receptor specificities ( a2 , a1 , and weakly a2 , respectively ) were administered to different groups of theophylline-fed and control rats , and their calcium excretions were measured .
C0001443
adenosine
C0050789
neca