1. Institute of Bioorganic Chemistry, Murmanskaya Street 1, 02094 Kiev, Ukraine, Fax: (internat.) +38‐044/573‐2552
2. Institute of Inorganic and Physical Chemistry, Universität Bremen, NW2, C2350, Leobener Str, 28334 Bremen, Germany, Fax: (internat.) +49‐(0)421/218‐4267