1. Natural Chemistry Research Group, Department of Chemistry, University of Turku, Vatselankatu 2, FI-20014 Turku, Finland
2. School of Agriculture, Policy and Development, University of Reading, Earley Gate, P. O. Box 236, Reading RG6 6AT, United Kingdom
3. School of Chemistry, Food and Pharmacy, University of Reading, Whiteknights, P. O. Box 224, Reading RG6 6AP, United Kingdom