1. School of Science Qiongtai Normal University Haikou 571127 China
2. Hainan Provincial Key Laboratory of Quality and Safety for Tropical Fruits and Vegetables Analysis and Test Center Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China
3. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources Hainan University Haikou 570228 China
4. Department of Medicinal Chemistry and Natural Medicine Chemistry College of Pharmacy Harbin Medical University Harbin 150081 China