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Figure 8: The glutathione level (a and b), glutathione reductase (c and d) and glutathione peroxidase activity (e and f) of compound 6 and compound 9 on glutamateinduced cytotoxicity in HT22 cells. Cells were pretreated with 0.1, 1, and 10 μM of compound 6 and 10, 50 and 100 μM of compound 9 and trolox (30 μM). Then, 30 μl of 2.5 mM glutamate was treated after 1 h. Each bar represents the mean ± standard deviation of three independent experiments. *P < 0.05, **P < 0.01, ***P < 0.001 versus glutamateinjured cells (ANOVA) 
