A benzamide derivative represented by the following Formula 1 or a pharmaceutically acceptable salt thereof. ** (See formula) ** in which R1 is NHR6； R2 is hydrogen, (C1-C6) alkyl or (C1-C6) alkoxy； R3 is (C1-C6) alkyl or (C1-C6) alkoxy having at least one hydrogen atom unsubstituted or substituted by halogen； R4 is a hydroxyl, alkoxy (C1-C6), aromatic cycloalkoxy (C3-C6), aliphatic cycloalkoxy (C3-C6) or alkylalkoxy (C1-C6) group having at least one aromatic ring (C3-C6) or aliphatic ring (C3-C6)； R5 is (C1-C6) alkyl, (C1-C6) alkoxy or halogen； R6 is CH2R11； and R11 is an aliphatic (C5-C6) heterocyclic group having at least one carbon atom replaced by O, in which the number of carbons present in the aliphatic heterocyclic group (C5-C6) is that before the replacement of one of they by oxygen, in which the heteroaliphatic ring of R11 is substituted with at least one substituent selected from a group consisting of； hydroxy, NR21R22, halogen and aliphatic heterocyclic group (C5-C6) having at least one carbon atom replaced by O or N, wherein R21 and R22 are each independently hydrogen, (C1-C6) alkyl or phenyl.Un derivado de benzamida representado por la Fórmula 1 siguiente o una sal farmacéuticamente aceptable del mismo. **(Ver fórmula)** en la que R1 es NHR6； R2 es hidrógeno, alquilo (C1-C6) o alcoxi (C1-C6)； R3 es alquilo (C1-C6) o alcoxi (C1-C6) que tiene al menos un átomo de hidrógeno sin sustituir o sustituido con halógeno； R4 es un grupo hidroxilo, alcoxi (C1-C6), cicloalcoxi aromático (C3-C6), cicloalcoxi alifático (C3-C6) o alquilalcoxi (C1-C6) que tiene al menos un anillo aromático (C3-C6) o anillo alifático (C3-C6)； R5 es alquilo (C1-C6), alcoxi (C1-C6) o halógeno； R6 es CH2R11； y R11 es un grupo heterocíclico alifático (C5-C6) que tiene al menos un átomo de carbono reemplazado por O, en el que el número de carbonos presentes en el grupo heterocíclico alifático (C5-C6) es aquel antes del reemplazo de uno de ellos por oxígeno, en el que el anillo heteroalifátic
