1. Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, 150 Zabolotnogo St., UA-03143, Kyiv-143, Ukraine, Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, and Ecole Centrale de Lyon, CEGELY, UMR CNRS 5005, 36 avenue Guy de Collongue, F-69134 Ecully Cedex, France