Biochem/physiol Actions Selective A1 adenosine receptor agonist. Application N6-(2-Phenylethyl)adenosine is an adenosine analogue that upon phosphorylation may be used to study the cystic fibrosis transmembrane conductance regulator (G551D-CFTR). N6-(2-Phenylethyl)adenosine is used to study the effects of adenosine analogues on adenosine receptor functions.