[1] Russian Acad Sci, Shemyakin Ovchinnikov Inst Bioorgan Chem, 16-10 Miklukho Maklaya, Moscow 117997, Russia
[2] DI Mendeleev Russian Univ Chem Technol, Miusskaya Sq 9, Moscow 125047, Russia
[3] Katholieke Univ Leuven, II,Herestraat 49,POB 922, B-3000 Leuven, Belgium