Antibiotics from Algae, XXXVI.1,2Phlorotannins from the Brown AlgaCystoseira granulata

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Abstract
Phloroglucinol triacetate and eight oligomers of phloroglucinol (phlorotannins) were isolated from a phenolic fraction of Cystoseira granulata extracted by ethyl acetate. The structures were elucidated by spectroscopic methods using the acetyl derivates. In addition to the three known oligomers, diphlorethol acetate, bifuhalol acetate, triphlorethol-B-heptaacetate, five new substances were isolated: fucotriphlorethol-B-dodecaacetate, fucotetraphlorethol-A-tetradecaacetate, fucopentaphlorethol-A-hexadecaacetate, fucoheptaphlorethol-A-eicosaacetate and an unidentified 8-membered-ring compound.

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