Yan Chen1, Ding Qu2, Jing Zhou2, Gao Xia2, Congyan Liu2. 1. Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Nanjing 210028, China. Electronic address: ychen202@hotmail.com. 2. Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Provincial Academy of Chinese Medicine, Nanjing 210028, China.