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(A) Chemical synthesis of Trt-l-4(NFmoc)Aph-OH (9). (B) Complete total SPPS strategy, based on a quaternary Fmoc/Trt/Dmab/(tBu/Boc) protection scheme, developed in this study for the preparation of lactam fengycin analogues 17A–D. Product purities of the crude materials are given as analyzed by RP-HPLC (λ= 220 nm). (C) HPLC traces of crude peptides 17A–D (λ= 220 nm).
