1. Department
of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
2. Centre
for Theoretical and Computational Chemistry (CTCC), Department of
Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
3. Department
of Process
Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States