Bifuhalol is a

phlorotannin Phlorotannins are a type of tannins found in brown algae such as kelps and rockweeds or sargassacean species, and in a lower amount also in some red algae. Contrary to hydrolysable or condensed tannins, these compounds are oligomers of phlorogl ...

. The ethanol extract of the brown alga '' Sargassum ringgoldianum'' contains phlorotannins of the bifuhalol type, which shows an antioxidative activity.

References

Phlorotannins Natural phenol oligomers {{aromatic-stub