1. Max Planck Institute for Polymer Research, 55128 Mainz, Germany
2. Instituto
de Química, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, 91501-970 Porto Alegre-RS, Brazil
3. Johannes Gutenberg Universität Mainz, Institute
of Pharmacy and Biochemistry, 55128 Mainz, Germany