1. School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering , Zigong 643000 , Sichuan , P. R. China
2. Department of Chemistry , Oxford University , 12 Mansfield Road , Oxford , Oxfordshire OX1 3TA , UK
3. Department of Chemistry , College of Science, Taif University , P. O. Box 11099 , Taif 21944 , Saudi Arabia
4. Inner Mongolia University Research Center for Glycochemistry of Characteristic Medicinal Resources , School of Chemistry and Chemical Engineering, Inner Mongolia University , Hohhot 010021 , P. R. China