A compound of formula (I): ** Formula ** or a pharmaceutically acceptable salt, solvate or stereoisomer thereof, for use in a method of treatment, control or prevention of a cancer of the blood or bone marrow, in where: R1 is: hydrogen； halo； - (CH2) nOH； (C1-C6) alkyl, optionally substituted with one or more halo； (C1-C6) alkoxy, optionally substituted with one or more halo； or - (CH2) nNHRa, where Ra is: hydrogen； (C1-C6) alkyl, optionally substituted with one or more halo； - (CH2) n- (aryl of 6 to 10 members)； -C (O) - (CH2) n- (6 to 10-membered aryl) or -C (O) - (CH2) n- (6 to 10-membered heteroaryl), wherein the aryl or heteroaryl is optionally substituted with one or more of: halo； -SCF3； (C1-C6) alkyl, the same optionally substituted with one or more halo； or (C1-C6) alkoxy, the same optionally substituted with one or more halo； -C (O) -C1-C8 alkyl, wherein the alkyl is optionally substituted with one or more halo； -C (O) - (CH2) n- (C3-C10 cycloalkyl)； -C (O) - (CH2) n-NRbRc, where Rb and Rc are each independently: hydrogen； (C1-C6) alkyl, optionally substituted with one or more halo； (C1-C6) alkoxy, optionally substituted with one or more halo； or aryl of 6 to 10 members, optionally substituted with one or more of: halo； (C1-C6) alkyl, the same optionally substituted with one or more halo； or (C1-C6) alkoxy, the same optionally substituted with one or more halo； -C (O) - (CH2) n-O-(C1-C6) alkyl； or -C (O) - (CH2) n-O- (CH2) n- (aryl of 6 to 10 members)； R2 is: hydrogen； - (CH2) nOH； phenyl； -O-C1-C6 alkyl； or (C1-C6) alkyl, optionally substituted with one or more halo； R3 is: hydrogen； or (C1-C6) alkyl, optionally substituted with one or more halo； and n is 0, 1 or 2.Un compuesto de fórmula (I):**Fórmula** o una sal farmacéuticamente aceptable, solvato o estereoisómero del mismo, para su uso en un método de tratamiento, control o prevención de un cáncer de la sangre o de la médula ósea, en donde: R1 es: hidrógeno； halo； -(CH2)nOH； alquilo (C1-C6), opcionalm
