1. Department of Chemistry and
the Center for Advanced Scientific Computing and Modeling, University of North Texas, 1155 Union Circle, No. 305070,
Denton, Texas 76203-5070, United States
2. Organisch-Chemisches Institut der Universität Heidelberg Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
3. Department of Chemistry and Chemical
Biology, Cornell University, Baker Laboratory,
Ithaca, New York 14853-1301, United States