N-benzylpiperazine compounds

A compound selected from those of formula (I):

• wherein:
• R1 represents linear or branched (C1-C6)alkyl,
• R2 represents hydroxy, linear or branched (C1-C6)alkoxy, or amino, optionally substituted by one or two linear or branched (C1-C6)alkyl groups,
• n represents an integer from 1 to 12 inclusive,
• R3 represents:
• hydrogen,
• linear or branched (C1-C12)alkyl optionally substituted by phenyl, which may also be optionally substituted by one or more identical or different substituents selected from halogen and linear or branched (C1-C6)alkyl, linear or branched (C1-C6)alkoxy, hydroxy and trihalomethyl, or said alkyl is optionally substituted by (C3-C7)cycloalkyl, carboxy or (C1-C6)alkoxy-carbonyl,
• (C3-C7)cycloalkyl,
• pyrimidine optionally substituted by one or two pyrrolidinyl groups, or
• phenyl optionally substituted by one or more identical or different substituents selected from halogen and linear or branched (C1-C6)alkyl, linear or branched (C1-C6)alkoxy, hydroxy and trihalomethyl,
• its optical isomers, or an addition salt thereof with a pharmaceutically acceptable acid or base.