1. Laboratory
of Organic Chemistry and Chemical Biology, Department of Chemistry, University of Turku, FI-20014 Turku, Finland
2. Chemistry
and Biochemistry Laboratory, Food Production and Quality Division,
School of Agriculture, Policy and Development, University of Reading, P.O. Box 236, 1 Earley Gate, Reading RG6 6AT, United Kingdom
3. U.S.
Dairy Forage Research Center, Agricultural Research Service, U.S.
Department of Agriculture, 1925 Linden Drive West, Madison, Wisconsin 53706, United States