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OSW‐1 is a well‐known natural saponin with potent antitumor activities. We have designed and prepared a small library of 22 OSW‐1 analogues with a variety of p‐acylamino‐benzoyl groups installed at C2” of the xylose residue, wherein a regioselective (1→3)‐glycosylation of arabinoside 3,4‐diol has been achieved by manipulation of the protecting groups on the imidate donors. Bioassays lead to new structure‐activity...
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