1. Department of Bioorganic Chemistry; Leibniz-Institute of Plant Biochemistry; Weinberg 3 06120 Halle Germany
2. LabSelen-NanoBio-Departamento de Química; Universidade Federal de Santa Maria; CEP 97105-900 Santa Maria, Rio Grande do Sul Brazil
3. Spectroscopy and Polymers Laboratory (LEPOL); Department of Physics; Universidade Federal de Santa Maria; CEP 97105-900 Santa Maria, Rio Grande do Sul Brazil
4. Center for Natural Products Research; Faculty of Chemistry; University of Havana; Havana 10400 Cuba
5. Institute of Chemistry; Martin-Luther-University Halle-Wittenberg; Kurt-Mothes-Str. 2 06120 Halle Germany