1. Department of Analytical Development & Research, Section Phytochemical Research, WALA Heilmittel GmbH, Dorfstraße 1, 73087 Bad Boll/Eckwälden, Germany
2. University of Hohenheim, Institute of Food Chemistry, Garbenstraße 28, 70599 Stuttgart, Germany
3. Department of Bioorganic Chemistry, University of Hohenheim, Institute of Chemistry, Garbenstraße 30, 70599 Stuttgart, Germany