Abstract
WITHDRAWN TO APPEAR IN SPECIAL ISSUE IN 2007
Acknowledgements
The support of the National Science Foundation (Grant Nos. CHE-0132584 and CHE-0514256), the donors of the Petroleum Research Fund, administered by the American Chemical Society, and the Minnesota Supercomputer Institute are gratefully acknowledged. KRL is delighted to honour John Brown on the occasion of his 65th birthday and recalls with gratitude both the help he received as a postdoctoral fellow and the unique combination of warmth and authority with which it was given.
Notes
† Present address: Department of Chemistry, Columbia University, New York, New York 10027.
‡ Present address: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138.