A compound of the formula: ** Formula ** in which R1 is Cl or CH3; R2 is C≡N, -CH2SO2CH3, -CONHCH3, -CH2NR4R5, or -CH2C≡N; R3 is C1-C2 alkyl, C1-C2 fluoroalkyl or C (O) CH3; R4 is H, C (O) CH3, CO2CH3 or SO2CH3; and R5 is H or is combined with R4 to form pyrrolidin-2-one; or a pharmaceutically acceptable salt thereof.Un compuesto de fórmula:**Fórmula** en la que R1 es Cl o CH3; R2 es C≡N, -CH2SO2CH3, -CONHCH3, -CH2NR4R5, o -CH2C≡N; R3 es alquilo C1-C2, fluoroalquilo C1-C2 o C(O)CH3; R4 es H, C(O)CH3, CO2CH3 o SO2CH3; y R5 es H o se combina con R4 para formar pirrolidin-2-ona; o una sal farmacéuticamente aceptable del mismo.