1. Bioproducts Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Albany, California 94710, United States
2. Berkeley Center for Green Chemistry, University of California, Berkeley, California 94720, United States
3. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department of Chemistry, University of California, Berkeley, California 94720, United States
5. Kenneth S. Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720, United States