1. Pacific Institute of Bioorganic Chemistry of the Far East Branch of the Russian Academy of Science, Vladivostok-22, Russian Federation, Instituto di Chimica Biomolecolare (ICB-CNR), Via Campi Flegrei, 80078 Pozzuoli, Napoly, Italy, and Suntory Institute for Bioorganic Research, 1-1-1, Wakayamadai, Shimamoto, Mishima, Osaka, 618-8503, Japan