**Supplementary Materials:** The following are available online at http://www.mdpi.com/2076-2607/8/3/350/s1.

**Author Contributions:** The project approach was designed by K.S., W.P.-a., S.L.; *Streptomyces* strain was selected by K.S.; activity-guided purification was conducted by K.S., M.M., K.D.; structural determination was conducted by K.S., M.M., K.D.; antimicrobial activity was measured by K.S.; the research was supervised by K.S., W.P.-a., S.L.; funding was acquired by M.M. and S.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research work was partially supported by Chiang Mai University, the Thailand Research Fund (TRF) within the program entitled Research and Researchers for Industries (RRi) PHD56I0048 with the cooperation of Trang Palm Oil Co., Ltd., Thailand, and the Institute for Fermentation, Osaka (IFO), Japan.

**Acknowledgments:** We thank Kenichiro Nagai, School of Pharmacy, Kitasato University, for help in obtaining mass data, and Toshiyuki Tokiwa, Kitasato Institute for Life Sciences, Kitasato University, for providing the microbes used to measure antimicrobial activity.

**Conflicts of Interest:** The authors declare no conflicts of interest.
