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Bioassay-guided separation of a lipophilic extract of the crinoid Alloeocomatella polycladia , inhibiting the activity of HCV NS3 helicase, yielded two groups of molecules: cholesterol sulfate and four new aromatic sulfates 1 - 4 . The structures of the aromatics were elucidated by spectroscopic analysis in addition to theoretical studies. The aromatic sulfates 1 - 4 showed moderate inhibition against NS3 helicase with IC 50 values of 71, 95, 7, and 5 μM, respectively.

Four Aromatic Sulfates with an Inhibitory Effect against HCV NS3 Helicase from the Crinoid Alloeocomatella polycladia