The Symposium programme covers all aspects and topics of chemistry of nucleic acid components (nucleobases, nucleosides, nucleotides, oligonucleotides and nucleic acids). The main themes will include organic synthesis, bioorganic chemistry, medicinal chemistry, physical chemistry and biophysics, biochemistry and chemical biology. The programme will consist of 15 invited plenary lectures, ca 40 selected contributing oral presentations (15-20') and a poster session.