1. Stratingh Institute for ChemistryUniversity of Groningen Nijenborgh 7 9747 AG Groningen Niederlande
2. Institute of Pharmaceutical Chemistry Marbach Weg 6 35032 Marburg Deutschland
3. Centre for Systems Chemistry, Stratingh Institute for ChemistryUniversity of Groningen Nijenborgh 4 9747 AG Groningen Niederlande