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Two new biologically active polyoxygenated sterols, 3,5,9‐trihydroxycholest‐7‐en‐6‐one (1) and cholest‐7‐ene‐3,6,9‐triol (3), together with one known sterone, topsentisterol D3 (2), were isolated from freshwater clam (Corbicula flumineaMuller; an important cultured edible shellfish in Taiwan). The structure elucidation of sterols 1–3 were accomplished by 1H‐ and 13C‐NMR, HMQC, and HMBC, and MS analyses...
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