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Side-chain elongation of 21: preparation of dipeptides 23 and 24. Experimental conditions: Step 1 (Fmoc removal), 20% DEA in DCM, 30 min, r.t.; Step 2 (coupling): Fmoc-l-Ala-OH or Fmoc-d-Ala-OH, HOBt monohydrate/EDC/DIEA/DCM, overnight, r.t.
