Mechanisms of Resistance Eduard Melief, Shilah A. Bonnett, Edison S. Zuniga, Tanya Parish DOI: 10.1128/AAC.01505-18 ABSTRACT The diaminoquinazoline series has good potency against Mycobacterium tuberculosis. Resistant isolates have mutations in Rv3161c, a putative dioxygenase. We carried out metabolite analysis on a wild-type strain and an Rv3161c mutant strain after exposure to a diaminoquinazoline. The parental compound was found in intracellular extracts from the mutant but not the wild type.