PptT-IN-2 (compound 5k) is a potent inhibitor of with phosphopantetheinyl phosphoryl transferase ( PptT ) an IC 50 of 2.5 μM. Phosphopantetheinyl transferase, an essential enzyme that plays a critical role in the biosynthesis of cellular lipids and virulence factors in Mycobacterium tuberculosis. PptT-IN-2 has the potential for the research of tuberculosis.