1. Laboratory
for Organic Reactivity, Discovery and Synthesis (LORDS), Research
Center for the Natural and Applied Sciences, University of Santo Tomas, 1015 Manila, Philippines
2. Institut
für Organische Chemie, Universität Regensburg, D-93053 Regensburg, Germany
3. Leibniz-Institute for Natural Product Research and Infection Biology, Hans-Knöll-Institute (HKI), D-07745 Jena, Germany
4. Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
5. Plant
Sciences Laboratory, Research Center for the Natural and Applied Sciences, University of Santo Tomas, 1015 Manila, Philippines