The present invention relates to compounds of formula (I)wherein R is pyridyl, R1 is selected from Cl or NO2 and R2 is H or R is 2-nitrofuranosyl, R1 is selected from H, F, Cl, CH3 or OCF3 and R2 is selected from H, phenyl or benzyl associated pharmaceutical compositions and use of the compounds or compositions in therapy, in particular for the treatment of tuberculosis as well as a method for their preparation.