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Structure elucidation of N55. A, structure of N55. B, NMR assignment of N55. C, total synthesis of N55 for the absolute structure confirmation. PMP, para-methoxyphenyl; CAN, ceric ammonium nitrate; Bn, benzyl; PyBOP, benzotriazol-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate; DIPEA, diisopropylethylamine.
