1. Laboratory for Organic Reactivity, Discovery and Synthesis (LORDS), Research Center for the Natural and Applied Sciences, University of Santo Tomas, Espana Street, Manila1015, Philippines
2. The Graduate School, University of Santo Tomas, Espana Street, Manila1015, Philippines
3. Department of Chemistry, College of Science and Mathematics, Mindanao State University-Iligan Institute of Technology, Tibanga, Iligan City9200, Philippines
4. Institut für Organische Chemie, Universität Regensburg, Universitätstrasse 31, RegensburgD-93053, Germany
5. Leibniz-Institut für Pflanzenbiochemie, Weinberg 3, HalleD-06120, Germany