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Reagents and conditions: (a) HCl·Lys(Boc)–COMe, HBTU, HOBt, DIPEA, DMF. (b) i. LiOH·H2O, MeOH/H2O, 0 °C to rt; ii. R-NH2, HBTU, HOBt, DIPEA, DMF; iii. 4 N HCl in dioxane, 0 °C to rt, 50–68% in three steps.
