[1] Pharmacopeia Inc, Dept Biol, Princeton, NJ 08540 USA
[2] Pharmacopeia Inc, Dept Chem, Princeton, NJ 08540 USA
[3] Pharmacopeia Inc, Dept Analyt Chem, Princeton, NJ 08540 USA
[4] Washington Univ, Howard Hughes Med Inst, Dept Med, St Louis, MO 63110 USA
[5] Washington Univ, Howard Hughes Med Inst, Dept Mol Microbiol, St Louis, MO 63110 USA