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Relative oxygen radical absorption capacity (ORAC) of silychristin derivatives: (a) silychristin A; (b) 2,3-dehydrosilychristin A; (c) isosilychristin; (d) anhydrosilychristin; (e) silybin A. Data are presented as the average of two measurements with the respective standard error of the mean. The Ymax /Ymin values were as follows: (a) 100/11 ± 2; (b) 101 ± 1/0; (c) 100/12 ± 0.1; (d) 100/10 ± 0.1; (e) 100/20 ± 0.8.
