The present specification relates to a composition comprising (20S, 24R)-6-O-β-D-glucopyranosyl (1->2)-β-D-glucopyranoside-dammar-3-one-20,24-epoxy-6a, 12b, 25-triol, which is a novel ginsenoside, and pharmaceutically acceptable salts thereof, a hydrate thereof or a solvate thereof as an active ingredient. The composition exhibits an excellent antioxidant effect.

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