1. Department of Chemistry and
Biochemistry, University of Notre Dame,
Notre Dame, Indiana 46556, United States
2. Department of Chemistry, University of Washington, Box 351700, Seattle, Washington
98195, United States
3. Departments
of Pharmacology and
Neuroscience, The Johns Hopkins School of Medicine, 725
North Wolfe Street, Baltimore, Maryland 21205, United States
4. Carlsberg Laboratory, Gamle Carlsberg Vej 10, DK-1799, Copenhagen-V Denmark