1. a Chemistry Department, School of Pharmacy , Guangdong Pharmaceutical University , The Pepoles’ Hospital of Shiling Huadu, Guangzhou , P.R. China
2. b Guangzhou , P.R. China
3. c School of Medicine Chemistry and Chemical Engineering , Guangdong Pharmaceutical University , Guangzhou , P.R. China
4. d School of Basic Courses , Guangdong Pharmaceutical University , Guangzhou , People’s P.R. China