1. College of Chemistry and Chemical Engineering; Central South University; Changsha Hunan 410083 PR China
2. State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources; School of Chemistry & Pharmaceutical Sciences, Guangxi Normal University; Guilin Guangxi 541004 PR China
3. College of Materials and Environmental Engineering; Hunan University of Humanities, Science and Technology; Loudi Hunan 417000 PR China