Use of transition metal complex including 5,7-dimethyl-1,2,4-triazolo (1,5-a)pyrimidine ligand for treating parasitic disease (Chagas disease) caused by Trypanosomatidae family protozoa. Application Number: ES2436220-B2. Patent Assignee: UGR. Inventors: Salas Peregrin J M, Sanchez Moreno M, Marin Sanchez C, Rodriguez Maldonado C, Caballero Hernandez A B.