1. a Shafizadeh Rocky Mountain Center for Wood and Carbohydrate Chemistry , The University of Montana , Missoula , MT , 59812 , USA
2. b Chemistry Department , University of Waikato , Hamilton , New Zealand
3. c Emory University Crystallography Laboratory, Department of Chemistry , Emory University , Atlanta , GA , 30322 , USA
4. d Department of Chemistry and Biochemistry , The University of Montana , Missoula , MT , 59812 , USA