1. Institute of Pharmaceutical SciencesAlbert-Ludwigs-Universität Freiburg Albertstrasse 25 79104 Freiburg Germany
2. INCITAP-CONICET, Departamento de QuímicaFacultad de Ciencias Exactas y NaturalesUniversidad Nacional de La Pampa Avenida Uruguay 151 6300 Santa Rosa La Pampa Argentina
3. Institute of Biochemistry and Technical BiochemistryUniversity of Stuttgart Allmandring 31 70569 Stuttgart Germany
4. Institute of MicrobiologyUniversity of Stuttgart Allmandring 31 70569 Stuttgart Germany