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Synthesis of desmuramyl peptides modified at N-terminus. Reagents and conditions: a) TFA/DCM 1:2, rt, 1 h, quantitative; b) EDC·HCl, HOBt·H2O, Et3N, DCM/dioxane 1:1, 0 °C → rt, 48 h, 82%; c) TFA/DCM 1:2, rt, 1 h followed by chromatographic separation of isomers, 43%.
