Antibacterial activity of compounds 6(a–d) and 8(a–l) at different concentrations.

Compound	Zone of inhibition (mm)
	Gram positive bacteria				Gram negative bacteria
	Staphylococcus aureus		Bacillus subtilis		Escherichia coli		Klebsiella pneumonia
	10 μg mL−1	20 μg mL−1	10 μg mL−1	20 μg mL−1	10 μg mL−1	20 μg mL−1	10 μg mL−1	20 μg mL−1
6a	12	18	11	21	08	11	06	10
6b	09	19	12	19	10	12	04	11
6c	10	20	10	22	11	15	07	09
6d	12	17	09	18	09	12	12	14
8a	22	32	23	40	16	21	14	20
8b	15	24	16	32	13	16	08	14
8c	18	36	16	34	14	18	09	16
8d	23	32	22	42	18	23	13	20
8e	16	23	15	32	12	16	08	13
8f	18	25	19	38	15	19	11	17
8g	24	34	22	42	18	25	12	22
8h	15	24	16	28	14	17	06	13
8i	16	27	19	39	12	20	09	17
8j	26	34	27	39	21	29	14	22
8k	19	26	16	32	12	14	06	12
8l	19	27	18	37	14	25	08	15
Gatifloxacin	20	30	20	40	15	20	10	18