1. Institute of Bioorganic and Petroleum Chemistry, Ukrainian Academy of Sciences, Murmanskaya, 1, Kiev-660, 253660, Ukraine, Laboratoire de Neuro-Heuristique, Institut de Physiologie, Faculté de Médicine, Université de Lausanne, Rue du Bugnon 7, Lausanne, CH-1005, Switzerland, ChemQuest, Cheyney House, 19-21 Cheyney Street, Steeple Morden, Herts, SG8 0LP, UK, and Centre for Molecular Design, University of Portsmouth, Portsmouth, Hants, PO1 2EG, UK