Table 2. . Activity against Mtb H37Rv at lower starting concentrations for bis-(imidazole/benzimidazole)-pyridine derivatives 2b, 5, 4f, 6c and 6f.

Compound	MIC aerobic condition (μM)	IC50 (μM)	IC90 (μM)
2b†	101	93	100
5	>50	>50	>50
4f†	104	45	140
6c†	87	34	110
6f†	16	11	20
Rifampicin	0.0063	0.0040	0.0077

^†Values indicate that compounds have a very good activity.

IC₅₀: 50% inhibition of growth; IC₉₀: 90% inhibition of growth; MIC: Minimum inhibitory concentration.