A unique ring-expanded acyclic nucleoside analogue that inhibits both adenosine deaminase (ADA) and guanine deaminase (GDA; guanase): synthesis and enzyme inhibition studies of 4,6-diamino-8H-1-hydroxyethoxymethyl-8-iminoimidazo[4,5-e][1,3]diazepine.

The synthesis and enzyme inhibition studies of a novel ring-expanded acyclic nucleoside analogue are reported. Compound has been found to be a competitive inhibitor of both adenosine deaminase (ADA) and guanine deaminase (GDA; guanase) with K(i)'s equal to 1.52+/-0.34 x 10(-4) M and 2.97+/-0.25 x 10(-5) M, respectively. Inhibition of two enzymes of purine metabolism may bear beneficial implications in antiviral therapy.