Biological activity of coumarin-indole derivatives 50–55.

Compd.	Activity	Ref.
50	MCF-7 cells: IC50 = 7.4 μM	79
51	MCF-7 cells: IC50 = 8.01 μM	80
52	MCF-7 cells: IC50 = 17.5 μM	81
53	HOP-92 cells: GI50 = 0.95 μM	82
54	MRSA: MIC = 0.25 μg mL−1	83
	E. faecalis: MIC = 0.25 μg mL−1
	S. aureus ATCC 25922: MIC = 0.25 μg mL−1
	S. aureus ATCC 29213: MIC = 0.25 μg mL−1
	E. coli: MIC = 0.25 μg mL−1
	A. baumannii: MIC = 0.25 μg mL−1
Norfloxacin	MRSA: MIC = 4 μg mL−1	83
	E. faecalis: MIC = 4 μg mL−1
	S. aureus ATCC 25922: MIC = 4 μg mL−1
	S. aureus ATCC 29213: MIC = 2 μg mL−1
	E. coli: MIC = 2 μg mL−1
	A. baumannii: MIC = 4 μg mL−1
55	M. tuberculosis H37Rv strain: MIC = 2.02 μM	84