A compound of the structural formula I, a pharmaceutically acceptable salt, prodrug or derivative thereof, characterized in that R1 is selected from H, a linear or branched (C1-C5) alkyl group and a COR4 group； R2 is selected from H, a linear or branched (C1-C5) alkyl group and a COR5 group； R3 is selected from H, a linear or branched (C1-C5) alkyl group, a linear or branched (C1-C5)- O-alkyl group, a cycloalkyl of (C5-C6) carbon atoms, an aryl group, and an aryl (C1-C5) alkyl group wherein the aryl group can be an unsubstituted aryl or an aryl substituted with one or more R6 groups and an NHCOR5 group, or the R2 and R3 groups together with N may form a substituted or unsubstituted piperidine, morpholine or piperazine group； R4 is selected from H and a (C1-C5) alkyl group； R5 is selected from an unsubstituted aryl group or an aryl group substituted with one or more R6, linear or branched (C1-C5) alkyl or pyridyne groups and a pyridine group； R6 is selected from (C1-C5) alkyl groups, halogen and nitro, provided that R1, R2 and R3 are not H atoms at the same time. The compounds present antibacterial activity. Process for their preparation and pharmaceutical compositions comprising them are also disclosed.Compuestos que responden a la fórmula estructural (ver Fórmula) sus sales, profármacos o derivados farmacéuticamente aceptables de los mismos, en donde R1 se selecciona entre H, un grupo alquilo (C1-C5) lineal o ramificado y un grupo COR4 R2 se selecciona entre H, un grupo alquilo (C1-C5) lineal o ramificado y un grupo COR5 R3 se selecciona entre H, un grupo alquilo (C1-C5) lineal, o ramificado, un grupo -O-alquilo (C1-C5) lineal o ramificado, un cicloalquilo de (C5-C6) carbonos, un grupo arilo, un grupo alquil (C1-C5) arilo y donde el grupo arilo puede estar sin sustituir o estar sustituido por uno o más grupos R6 y un grupo NHCOR5 o R2 y R3 juntos forman con el N un grupo piperidino, un grupo morfolino o un grupo piperazino, sustituidos o sin sustituir； R4 se selecc
