Drug Quality and Registration (DruQuaR) group;
Faculty of Pharmaceutical Sciences;
Ghent University;
Ottergemsesteenweg 460;
B-9000 Ghent;
Belgium;
LIWET;
Department of Industrial Biological Sciences;
Ghent University Campus Kortrijk;
Graaf Karel de Goedelaan 5;
B-8500 Kortrijk;
Belgium;
N-alkylamides; Achillea; millefolium; Achillea; ptarmica; HPLC–ESI–MS; GC–EI–MS;