1. Department of Pharmaceutical Sciences; Universidade Federal de Santa Catarina, Campus Universitário - Trindade; Florianópolis 88040-970 SC Brazil
2. Department of Clinical Analysis, Centre of Health Sciences; Universidade Federal de Santa Catarina, Campus Universitário - Trindade; Florianópolis 88040-970 SC Brazil
3. Department of Organic Chemistry, Faculty of Science; University of Yaoundé 1; P.O. Box 812 Yaoundé Cameroon
4. Institute of Organic Chemistry; Johannes Gutenberg-University of Mainz; Duesbergweg 10-14 55128 Mainz Germany