Scheme 2.
Retrosynthesis of phomopsin B. Ac = acetate, Alloc = allyloxycarbonyl, Bn = benzyl, Ns = 2-nitrobenzenesulfonyl, TBS = t-butyldimethylsilyl, Teoc = 2-(trimethylsilyl)ethoxycarbonyl, Troc = 2,2,2-trichloroethoxycarbonyl.
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