A series of carbazole derivatives was tested for inhibition of Mycobacterium tuberculosis growth and a mammalian cell line. Among several compounds with anti-TB activity, carbazoles A and B showed MIC values of 4.0 μg mL−1 (8 μM) and 2.2 μg mL−1 (9 μM) respectively, against M. tuberculosis and were relatively nontoxic for the mammalian cell line.
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Choi et al. (2006) studied this question.