Trachyopsis halichondrioides

A sterol disulfate (534) and a sterol trisulfate (535), both closely related to halistanol, have been found in a species of Halichondria [447] and in Trachyopsis halichondrioides [448] respectively. 

The sterol sulfate, halistanol disulfate B (544) was isolated from a South African Pachastrella sp. The structure and stereochemistry of compound 544 were established mainly by interpretation of spectral data. Halistanol disulfate B (544) was active in the endothelin converting enzyme (ECE) assay at a micromolar concentration [451]. Three sterol trisulfates (545-547) have been isolated from the sponges Trachyopsis halichondrioides and Cymbastela coralliophila [452]. 

The structure of sokotrasterol sulfate (548), isolated from sponges of the family Halichondriidae was determined by X-ray analysis [453-455]. The steroid, 26-norsokotrasterol sulfate (549), was isolated from the marine sponge Trachyopsis halichondrioides and was identified by NMR spectroscopic analysis [456]. 

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See also in sourсe #XX -- [ ]

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