Four new carbazole alkaloids, clausenawallines C−F (1−4), along
with 18 known compounds (5−22) were isolated from the roots of Clausena
wallichii. Compounds 3, 9, and 22 exhibited significant antibacterial activity against
methicillin-resistant Staphylococcus aureus SK1 (MRSA SK1) and Staph. aureus
TISTR 1466 with MIC values in the range 4−16 μg/mL, whereas compound 4
showed the highest cytotoxicity against oral cavity cancer (KB) and small-cell lung
cancer (NCI-H187) with IC50 values of 10.2 and 4.5 μM, respectively.