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Synthesis of the left-side fragments 31 and 28 and the right-side fragments 26 and 38. Tf, trifluoromethanesufonyl; L-Selectride, lithium tri-sec-butylborohydride; Superhydride, lithium triethylborohydride; TBAF, tetrabutylammonium fluoride; DIBAL-H, diisobutylaluminum hydride; mCPBA, meta-cloroperoxybenzoic acid.
