1. Institute of Chemistry, NAWI Graz, BioTechMed GrazUniversity of Graz Heinrichstr. 28 8010 Graz Austria
2. Institute of BiochemistryGraz University of Technology Petersgasse 12/II 8010 Graz Austria
3. Chemistry of Natural & Microbial Products DepartmentNational Research Centre 33 El Buhouth St 12622 Cairo Egypt
4. Austrian Centre of Industrial Biotechnology, c/o Institute of Molecular BiosciencesUniversity of Graz Humboldtstraße 50 8010 Graz Austria
5. Molecular Enzymology GroupUniversity of Groningen Nijenborgh 4 9747AG Groningen The Netherlands