Novel compounds with antibacterial activity

Compounds of formula (I):

• wherein
• A is an oxygen, sulphur or nitrogen atom or a C1-4alkylene, C2-4alkenylene, C2-4alkynylene or C1-4heteroalkylene group,
• X1, X2, X3, X4 and X5 are each independently of the others nitrogen atoms or groups of formula CR2,
• R1 is a hydrogen atom, a halogen atom, a hydroxy group, an alkyloxy group or a heteroalkyloxy group,
• R2 is a hydrogen atom, a halogen atom, or a hydroxy, alkyl, alkenyl, alkynyl or heteroalkyl group,
• R3 is selected from the following groups:
• the radicals R4, each independently of any other(s), are a hydroxy group, a C1-6alkyl group or a C1-8heteroalkyl group,
• R5 is an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkyl-cycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical,
• n is 0, 1, 2 or 3 and
• m is 0 or 2,
• or a pharmacologically acceptable salt, solvate, hydrate or a pharmacologically acceptable formulation thereof.