1. Division of Applied Life Science (Brain Korea 21 program), Graduate School of Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea, Division of Chemical Enzymology, Faculty of Chemistry, M. V. Lomonosov Moscow State University, 119992 Moscow, Russia, and All-Russia State Center For Quality And Standardization of Veterinary Drugs and Feed, Moscow 123022, Russia