Diphlorethol 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 ...

found in the brown alga ''

Cystophora retroflexa ''Cystophora retroflexa'' is a brown alga species in the genus '' Cystophora.'' It found is found off the coasts of New Zealand and Australia. It is the type species of the genus. Prefers more sheltered environments compared to other ''Cystophor ...

''. It falls under the phlorethols class of phlorotannins due to the ether bond that connects its two phloroglucinol units.

References

Phlorotannin dimers {{aromatic-stub