Table 7.

Inhibitory effects of positive control and 1–13 on NO production in RAW 264.7 cells.

No.	NRC (%)	No.	NRC (%)	No.	NRC (%)
Normal	1.5 ± 0.5	4	102.2 ± 3.1	10	91.5 ± 2.6**
Control	100.0 ± 3.3	5	73.3 ± 2.6***	11	56.5 ± 3.5***
DEX	71.8 ± 0.9***	6	103.8 ± 3.0	12	97.4 ± 1.1
1	101.6 ± 3.7	7	90.4 ± 2.6**	13	10.5 ± 0.3***
2	99.2 ± 1.9	8	90.2 ± 0.7**
3	99.9 ± 2.3	9	92.2 ± 2.4**

N, Unstimulated normal (negative control); C, Control group (stimulated by LPS); D, Dexamethasone (Dex, a positive control). Nitrite relative concentration (NRC): percentage of control group, which set as 100%. Values represent the mean ± SD of three determinations.

^**P < 0.01;

^***P < 0.001 (differences between the compound-treated group and the control group). n = 4. Final concentration was 20 μM for 1–13, and 1 μg/ml for Dex, respectively.