1. School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
2. Tianjin Key Laboratory of Therapeutic Substance of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
3. Department of Chemistry, National University of Singapore, Singapore 117543
4. National University of Singapore (Suzhou) Research Institute, Suzhou 215123, China