[1] Yale Univ, Dept Chem, New Haven, CT 06520 USA
[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA
[3] Univ Washington, Dept Biochem, Seattle, WA 98195 USA
[4] Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England
[5] Seattle Biomed Res Inst, Seattle, WA 98109 USA
[6] Univ Washington, Sch Publ Hlth & Community Med, Dept Pathobiol, Seattle, WA 98195 USA
[7] Univ S Florida, Dept Biochem & Mol Biol, H Lee Moffit Canc Ctr & Res Inst, Drug Discovery Program, Tampa, FL 33612 USA