Compounds of formula I.A ** Formula ** in which R 1 represents hydrogen, methoxy or trifluoromethoxy； R2 represents hydrogen or methoxy； R3 represents hydrogen or C1-C4 alkyl； R4 represents fluorinated ethoxy or ethoxy； R5 represents hydrogen； R8 represents Br, Cl, F or CN； R7 represents Cl or F； X1 represents O, NH or CH2； X2 and X3 represent N or CH, with the proviso that X2 and X3 do not represent N at the same time； and X4 represents N or CH； as well as pharmaceutically acceptable salts thereof.Compuestos de fórmula I.A**Fórmula** en la que R1 representa hidrógeno, metoxilo o trifluorometoxilo； R2 representa hidrógeno o metoxilo； R3 representa hidrógeno o alquilo C1-C4； R4 representa etoxilo o etoxilo fluorado； R5 representa hidrógeno； R8 representa Br, Cl, F o CN； R7 representa Cl o F； X1 representa O, NH o CH2； X2 y X3 representan N o CH, con la condición de que X2 y X3 no representen N al mismo tiempo； y X4 representa N o CH； así como sales farmacéuticamente aceptables de los mismos.
