Epoxy-¿-lapachone (2,2-Dimethyl-3,4-dihydro-spiro[2H-naphtho[2,3-b]pyran-10,2¿-oxirane]-5(10H)-one): a promising molecule to control infections caused by protozoan parasites Juliana Figueiredo Peixoto; Adriane da Silva Oliveira; Luiz Filipe Gonçalves - Oliveira; Franklin Souza - Silva; Carlos Roberto Alves;