Novel cyclobutane Derivatives, processes for their preparation and pharmaceutical compositions comprising them.

摘要

The invention is directed to cyclobutane derivatives represented by general formula (I): <CHEM> wherein A represents a hydrogen atom, a hydroxy group, an azido group or an amino group; and B represents a purine residue or a pyrimidine residue. The cyclobutane derivatives exhibit antiviral and antitumor activities and are thus expected as drugs.