1. Nanyang Technological University Division of Chemistry & Biological Chemistry School of Physical & Mathematical Sciences Singapore 637371 Singapore
2. School of Pharmacy Guizhou University of Traditional Chinese Medicine Huaxi District Guiyang Guizhou 550025 China
3. Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China