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