Abstract
Three new marine polar steroids, the first chlorine-containing steroid sulfate ( 1), topsentiasterol sulfate F ( 2) and the first natural iodinated steroid ( 3) have been isolated from the marine sponge Topsentia sp. The structures of 1– 3 were elucidated using NMR and HRESIMS as well as by chemical correlation of 1 with previously known topsentiasterol sulfate D. Compound 1 proved to be an effective inhibitor of endo-1,3-β- d-glucanase from the marine mollusc Spisula sachalinensis.
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