clofazimine

noun

clo·​faz·​i·​mine klō-ˈfäz-ə-ˌmēn, -mən 

: a reddish brown powdered dye C₂₇H₂₂Cl₂N₄ that is a derivative of phenazine used especially to treat lepromatous leprosy

Dapsone and clofazimine are weakly bactericidal for M leprae but, in combination, will kill 99.999% of bacilli (the limit of detectability) within 3 months.

—Robert R. Jacobson and James L. Krahenbuhl, The Lancet