1. Department
of Biological Systems Engineering, Washington State University, Pullman, Washington 99164-6120, United States
2. Renewable
Materials Program, Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, Idaho 83844-1132, United States
3. Center
for NMR Spectroscopy, Washington State University, P.O. Box 644630, Pullman, Washington 99164−4630, United States