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Two new flavonoids, acanthophorin A (1) and acanthophorin B (2), along with three known compounds tiliroside (3), (‐)‐catechin (4) and quercetin (5) were isolated from the red alga Acanthophora spicifera. The structures of 1 and 2 were determined to be kaempferol 3‐O‐α‐L‐fucopyranoside (1) and quercetin 3‐O‐α‐L‐fucopyranoside (2) by spectroscopic methods. Both 1 and 2 showed significant antioxidant activity.
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Zeng et al. (2001) studied this question.
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