1. Laboratory for Molecular Microbiology; Department of Biology; Philipps-University; Karl-von-Frisch Str. 8 D-35043 Marburg Germany
2. Organic Geochemistry Group; MARUM - Center for Marine Environmental Sciences; University of Bremen; PO Box 330 440 D-28334 Bremen Germany
3. LOEWE-Center for Synthetic Microbiology; Philipps-University Marburg; Hans-Meerwein-Str. 6 D-35043 Marburg Germany
4. Kekulé-Institut for Organic Chemistry and Biochemistry; Friedrich-Wilhelms-University Bonn; Gerhard-Domagk Str. 1 D-53121 Bonn Germany
5. Institute of Organic Chemistry; TU Braunschweig Hagenring 30 D-38106 Braunschweig Germany