1. UCSD-CNRS
Joint Research Laboratory (UMI 3555), Department of Chemistry and
Biochemistry, University of California, San Diego, La Jolla, California 92093-0343, United States
2. UMR
CNRS 5250, Département de Chimie Moléculaire, Université Joseph Fourier B. P. 53, 38041 Cedex 9 Grenoble, France
3. UCSD Crystallography Facility, San Diego,
La Jolla, California 92093-0343, United States