9-vinyladenine was synthesized by a 'simple method

and a new polymer was prepared by copolymerization of 9-vinyladenine with maleimide. By comparing the IR

NMR and UV spectra of this polymer

with those of polyvinyladenine and polymalei-mide

it clearly shows that it is a copolymer having hydrogen bonds between molecular chains. This copolymer has the same UV absorption as nucleic acid.