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5-hydroxycyclopenicillone (1) scavenges DPPH free radicals in a concentration-dependent manner. Compound 1 or vitamin C (VitC) at indicated concentrations were added to 0.2 mM DPPH solution for 20 min. The concentration of DPPH free radicals was measured by evaluating the absorbance at 517 nm. Data are presented as the mean ± SEM of three separate experiments; ** p < 0.01 vs. the control group (ANOVA and Dunnett’s test).
