while it was confirmed that a c6 aminofunction is of importance for agonist activity , several compounds , in particular the relatively potent n6-hydroxylaminopurine ribonucleoside , were not antagonized by 8-p-sulfophenyltheophylline , indicating that some nucleosides cause smooth muscle relaxation by a mechanism other than adenosine receptor stimulation .
C0035546
ribonucleoside
C0028621
nucleosides