Table 2.

In vitro antibacterial activities of 22–28 against clinically isolated bacterial strains.

Compound	Minimum inhibitory concentration (MIC) in μg/mL
	S. aureus	B. subtilis	S. Typhi	V. cholerae	E.  coli	K. pneumoniae
22	25	25	50	50	100	100
23	—	100	—	100	50	50
24	50	50	100	50	25	100
25	12.5	50	25	25	6.25	—
26	100	100	100	—	25	100
27	25	25	50	25	6.25	50
28	12.5	12.5	25	12.5	6.25	25
Ciprofloxacin	12.5	25	25	12.5	12.5	25

“—” indicates no inhibition even at a higher concentration of 200 μg/mL.