1. Department of Bioengineering University of California, Riverside Riverside CA 92521 USA
2. Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44–52 01-224 Warsaw Poland
3. Present address: Graduate School of Science Nagoya University Chikusa Nagoya 464-8602 Japan
4. Department of Chemistry University of California, Riverside Riverside CA 92521 USA
5. Department of Physical Chemistry University of Chemistry and Technology Technická 5 166 28 Prague 6—Dejvice Czech Republic
6. Department of Biochemistry University of California, Riverside Riverside CA 92521 USA