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The synthetic scheme of ABP. a) MeOH:H2O = 9:1, v/v, 60 °C, 5 days, b) TFA : triisobutylsilane : H2O = 95 : 2.5 : 2.5, v/v, 0 °C, 30 min, c) Fmoc-Arg(pbf)-OH, HBTU, DIPEA/DMF, r.t., 2 days, d) 15 % piperidine/DMF, r.t., 30 min, e) TFA : triisopropylsilane : H2O = 95 : 2.5 : 2.5, v/v, r.t., 30 min.
