It refers to a formula (I) benzodiazepine derivative, such as 2 - [(4S) - 6 - (4-Chloro-phenyl) - 1-methyl-8 - (methyloxygen) - 4H - [1, 2, 4] - triazole - [4, 3-A] [1, 4] - benzo-dimethyl-4-1] - n-ethyl-acetyl-ethylamine. A pharmacological composition including this compound was also mentioned. This compound inhibits the association between brominated bet and acetyllysine residues.REFERIDA A UN DERIVADO DE BENZODIAZEPINA DE FORMULA (I) TAL COMO 2-[(4S)-6-(4-CLORO-FENIL)-1-METIL-8-(METILOXI)-4H-[1,2,4]-TRIAZOLO-[4,3-a][1,4]-BENZO-DIAZEPIN-4-IL]-N-ETIL-ACETAMIDA. TAMBIEN ESTA REFERIDA A UNA COMPOSICION FARMACEUTICA QUE COMPRENDE DICHO COMPUESTO (I). DICHO COMPUESTO INHIBE EL ENLACE DE LOS BROMODOMINIOS DE LA FAMILIA BET CON LOS RESIDUOS DE LISINA ACETILADA