Table 1: In vitro evaluation of antitubercular activity.

Compounds	MIC values (µg/mL) M. tuberculosis H37Rv
4a	100
4b	12.5
4c	12.5
4d	25
4e	25
4f	25
4g	6.25
4h	6.25
4i	3.125
4j	12.5
4k	12.5
4l	100
4m	12.5
4n	12.5
4o	50
pyrazinamide	3.125
streptomycin	6.25