[1] Univ Louisville, Dept Chem, Louisville, KY 40292 USA
[2] Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Dept Ciencias Farmaceut, Lima, Peru
[3] Univ Peruana Cayetano Heredia, Inst Med Trop Alexander Humboldt, Lima 100, Peru
[4] Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Dept Microbiol, Lima 100, Peru
[5] Johns Hopkins Sch Publ Hlth, Dept Int Hlth, Baltimore, MD 21205 USA
[6] Pontificia Univ Catolica Peru, Dept Quim, Lima 100, Peru