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Free sterol fractions were isolated from the marine sponges Phyllospongia madagascarensis, Scalarispongia sp., Oceanapia sp., Monanchora clathrata and studied by GLC, GLC–MS, and spectroscopy NMR. P. madagascarensis and Scalarispongia sp. contained common Δ 5 -sterols; cholesterol was shown to be a main sterol of both the sponges. Oceanapia sp. contained stanols and minor Δ 5 -sterols...
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