1. Institute of Natural Medicine & Green Chemistry; School of Chemical Engineering and Light Industry; Guangdong University of Technology; Guangzhou 510006 P. R. China
2. School of Chemical and Environment Engineering; Wuyi University; Jiangmen 529020 P. R. China
3. Susan Lehman Cullman Laboratory for Cancer Research; Department of Chemical Biology; Ernest Mario School of Pharmacy; Rutgers, The State University of New Jersey; 164 Frelinghuysen Road Piscataway NJ 08854 USA
4. Allan Conney Biotechnology Company Ltd.; Foshan 528200 P. R. China