The present invention concerns a compound of general formula (I): in which n=0 or 1, R1 represents an optionally substituted alkyl chain, in particular substituted alkyl chain, in particular substituted with fluorine, X is chosen from N and CH, and R2 is chosen from optionally substituted phenyl and benzyl, wherein the heterocycles having 6 vertices comprise one, two or three nitrogen atoms. The present invention also concerns the use of this compound as a medicament, in particular in the treatment of bacterial and mycobacterial infections such as tuberculosis in combination with an antibiotic that is active against bacteria and/or mycobacteria, said compound potentiating the activity of said antibiotic.