1. School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, P. R. China
2. National Demonstration Center for Experimental Ethnopharmacology Education, South-Central University for Nationalities, Wuhan 430074, P. R. China
3. Equipe de Chimie Analytique des Molécules Bioactives et Pharmacognoise, Institut Pluridisciplinaire Hubert Curien (UMR 7178, CNRS/UDS), 74 route du Rhin, 67400 Illkirch, France