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Bifuhalol is a phlorotannin. The ethanol extract of the brown alga Sargassum ringgoldianum contains phlorotannins of the bifuhalol type, which shows an antioxidative activity.^[1]

References

^ Nakai, Masaaki; Kageyama, Norihiko; Nakahara, Koichi; Miki, Wataru (2006). "Phlorotannins as Radical Scavengers from the Extract of Sargassum ringgoldianum". Marine Biotechnology. 8 (4): 409–414. Bibcode:2006MarBt...8..409N. doi:10.1007/s10126-005-6168-9. PMID 16602026. S2CID 29097842.

[1] Nakai, Masaaki; Kageyama, Norihiko; Nakahara, Koichi; Miki, Wataru (2006). "Phlorotannins as Radical Scavengers from the Extract of Sargassum ringgoldianum". Marine Biotechnology. 8 (4): 409–414. Bibcode:2006MarBt...8..409N. doi:10.1007/s10126-005-6168-9. PMID 16602026. S2CID 29097842.

[1]

Types of phlorotannins (tannins in brown algae)
Monomer	Phloroglucinol
Fucols	Difucol Trifucol Tetrafucol A Tetrafucol B cis-Pentafucol A
Phlorethols	Diphlorethol and diphlorethol A Triphloroethol A Tetraphlorethol A, B, C and E Pentaphlorethol-B Hexaphlorethol-A
Fucophlorethols	Fucophlorethol A and B Fucodiphlorethol A, D and G Fucotriphlorethol-B, G and H Fucotetraphlorethol-B, J and K Fucopentaphlorethol-E Bisfucotriphlorethol-A Bisfucotetraphlorethol-A Bisfucopentaphlorethol-A and B Bisfucoheptaphlorethol-A Difucophlorethol-A Difucofucotriphlorethol-A and B Difucofucotetraphlorethol-A Terfucopentaphlorethol-A Terfucohexaphlorethol-A and B Terfucoheptaphlorethol-A
Fuhalols	Bifuhalol Trifuhalol A Tetrafuhalol A
Isofuhalols	Tetraisofuhalol
Eckols	Dieckol Eckol Eckstolonol Phlorofucofuroeckol A and B 2-Phloroeckol 3-Phloroeckol 6,6'-Bieckol 7-Phloroeckol 8,4"'-Dieckol 8,8′-Bieckol
Halogenated phlorotannins	Bromotriphlorethol A1

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References

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