1. Department
of Chemistry University of Massachusetts, Amherst, Massachusetts 01003, United States
2. Lex Company Research Lab, Phoenix Park, 2 Shaker Road, Suite D 106, Shirley, Massachusetts 01464, United States
3. New England Peptide, 65 Zub
Lane, Gardner, Massachusetts 01440, United States
4. Department
of Chemistry, Brookhaven National Laboratory, Building 555A,
P.O. Box 5000 Upton, New York 11973, United States