1. Diaminopharm Inc., 880 Grandview Way, Unit 706, Toronto, Ontario, M2N 7B2, Canada
2. Department of Chemistry, KAIST, Daejon, 305‐701, Korea
3. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, Fax: +1‐416‐946‐7335