1. WALA Heilmittel GmbH Department of Analytical Development and Research Section Phytochemical Research Dorfstr. 1 DE-73087 Bad Boll/Eckwälden Germany
2. University of Hohenheim Mass Spectrometry Unit Core Facility Hohenheim Emil-Wolff-Str. 12 DE-70599 Stuttgart Germany
3. University of Hohenheim Institute of Chemistry, Bioorganic Chemistry (130b) Garbenstraße 30 DE-70599 Stuttgart Germany