EP0423805A2 — Condensed purine derivatives

USPTO Abstract

There are disclosed condensed purine derivatives represented by formula: alkyl or benzyl; each of X¹ and X² independently represents hydrogen, lower alkyl, aralkyl or phenyl; and n is an integer of 0 or 1; R¹ represents hydrogen, lower alkyl, alicyclic alkyl, noradamantan-3-yl, dicyclopropylmethyl or styryl; and R² represents hydrogen, lower alkyl or alicyclic alkyl; or a pharmaceutically acceptable salt thereof. The derivatives and pharmaceutically acceptable salts are useful as diuretics, renal protecting agents, antiallergic agents and hypotensives.