A compound that is 8-chloro-3-pentyl-3,7-dihydro-1H-purine-2,6-dione tris (hydroxymethyl) aminomethane anhydrate (Formula (IA): ** Formula **Un compuesto que es anhidrato de tris(hidroximetil)aminometano de 8-cloro-3-pentil-3,7-dihidro-1H-purina-2,6- diona (Fórmula (IA):**Fórmula**