1. Graduate School, University of Santo Tomas, Manila, Philippines;
2. Tiniguiban Heights, Palawan State University, Puerto Princesa City, Philippines;
3. Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, USA;
4. Institute of Biological Chemistry, Washington State University, Pullman, WA, USA;
5. Institute for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA
6. Phytochemistry Laboratory, Research Center for the Natural and Applied Sciences, University of Santo Tomas, Manila, Philippines;