1. Bioorganic Chemistry Laboratory, Military University Nueva Granada, Nueva Granada Campus, Cajicá 250247, Colombia
2. Department of Chemistry, Jackson State University, Jackson, MS 39217-0095, USA
3. Institute of Pharmaceutical Biology and Phytochemistry (IPBP), University of Münster, PharmaCampus-Corrensstrasse 48, D-48149 Münster, Germany