Efficacy of a series of alpha-pyrone derivatives against Leishmania (L.) infantum and Trypanosoma cruzi by Tempone, A, Ferreira, D, Lima, M, Costa Silva, T, Borborema, S, Reimão, J, Galuppo, M, Guerra, J, Russell, A, Wynne, G, Lai, R, Cadelis, M, Copp, B