Pharmaceutically efficacious pteridine derivatives

Abstract From the Canadian patent

A pharmaceutically efficacious pteridine compound of formula I:, (see fig.I), wherein A denote a bridging hydrocarbon group containing 1 to 8 carbon atoms and containing a (see fig.II) group directly bonded to the phenyl group and one of the methylene radicals of the bridging A group is optionally replaced by -O-;R1 is hydrogen a, cycloalkyl group with up to 7 carbon ring atoms or, an alkyl group having 1 to 6 carbon atoms benzyl, or aryl; R2 is hydrogen or an alkyl group having 1 to 6 carbon atoms, or wherein R1 and R2 together form a five- or six-membered heterocyclic group which optionally contains additional hereto atoms selected from the group consisting of nitrogen, oxygen and, …