1. Folkhälsan Research Center and Department of Clinical Chemistry, P.O. Box 60, FIN-00014 University of Helsinki, Finland; VTT Biotechnology and Food Research, P.O. Box 1500, FIN-02044 VTT, Finland; Laboratory of Organic Chemistry, Department of Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland; Central Research Laboratories, Yomeishu Seizo Company, Ltd., 2132-37 Naka-Minowa, Minowa-cho, Nagano 399-4601, Japan; and Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Health...