Irloxacin is a new quinolone derivative, and shows greater activity with an acid pH. Irloxacin has a good in vitro antimicrobial spectrum against both gram-positive and gram-negative bacteria.

Rifamycin S is a potent DNA-dependent RNA polymerase inhibitoris a quinone and an antibiotic agnet against Gram-positive bacteria.

NITD-564 is a novel, direct inhibitor of the mycobacterial enoyl-reductase InhA with IC50 of 0.59 uM, exhibits MIC50 of 160 nM against Mtb.