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Synthetic procedure for MPUPA-Dap(Ac)-Gly-OH, (S)-13, (R)-14. Reagents and conditions: (i) 20% Pip/DMF, rt, 10 min (×2); (ii) DCC/HOBt, DCM/DMF, rt, 3 h; (iii) PIFA, pyridine, THF/DMF/H2O (2:2:1), rt, 3 h; (iv) Ac2O, pyridine, DCM, rt, 1 h; (v) TFA/H2O/TIPS/PhOH (78:10:10.2 v/v/v/v), rt, 2.5 h.
