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The key intermediate, 2-isopropyl-2-(3-methyl-1-benzoxyl-5-phenylsulfonyl-3E-pentenyl)-1, 3-dithiocycllohexane(Ⅲ), for the total synthesis of Sarcophytol-A (1)was prepared through 7 steps from acetone. The key steps are nucleophilic addition of 2-1ithio-2