2-Amino-6-chloro-9H-purine-9-acetic acid may be used as starting material in the synthesis of:6-decyloxy substituted purine intermediates6-decylthio substituted purine intermediates6-decyloxy or 6-decylthio-9-phenylalanine/serine or alanine-substituted purine derivatives2,6-diaminopurine monomer