1. Organic Chemistry,
Department
of Chemistry, Faculty of Sciences, University of Hamburg, Martin Luther
King Platz 6, 20146 Hamburg, Germany
2. Institute of Chemistry, University
of Luebeck, Ratzeburger Allee 160, 23538 Luebeck, Germany
3. Carlsberg Laboratory, Gamle Carlsberg
Vej 10, 1799 Copenhagen V, Denmark