A compound represented by the following formula (I-aa): ** Formula ** in which R1 and R2 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a straight chain alkoxy group or branched having 1 to 5 carbon atoms, an acetyl group, a carbamoyl group, a carboxyl group, a straight or branched chain ester group having 1 to 5 carbon atoms, a straight, branched or cyclic chain alkyl group not substituted or substituted by halogen having 1 to 5 carbon atoms, or an NR3R4 group in which R3 and R4 are each independently a hydrogen atom, an oxygen atom, a straight chain, branched alkyl group or halogen substituted cyclic having 1 to 5 carbon atoms, or a straight or branched chain alkyloxycarbonyl group having 2 to 10 carbon atoms. R5 and R6 are each independently a hydrogen atom or a straight chain, branched or cyclic alkyl group unsubstituted or substituted with halogen having 1 to 5 carbon atoms； R7 is a straight, branched or cyclic chain alkyl group having 1 to 5 carbon atoms； E is an oxygen atom or an-NR8 group in which R8 is a hydrogen atom, or a straight or branched chain alkyl group having 1 to 5 carbon atoms； or a pharmaceutically acceptable salt thereof.Un compuesto representado por la siguiente fórmula (I-aa):**Fórmula** en la que R1y R2 son cada uno de forma independiente un átomo de hidrógeno, un átomo de halógeno, un grupo hidroxilo, un grupo alcoxi de cadena lineal o ramificada que tiene de 1 a 5 átomos de carbono, un grupo acetilo, un grupo carbamoilo, un grupo carboxilo, un grupo éster de cadena lineal o ramificada que tiene de 1 a 5 átomos de carbono, una grupo alquilo cadena lineal, ramificada o cíclico no sustituido o sustituido con halógeno que tiene de 1 a 5 átomos de carbono, o un grupo NR3R4 en el que R3 y R4 son cada uno de forma independiente un átomo de hidrógeno, un átomo de oxígeno, un grupo alquilo de cadena lineal, ramificada o cíclico sustituido con halógeno que tiene de 1 a 5 átomos de carbono, o un grupo alquiloxicarbonilo de
