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Key features of PEPSTAR: Activated Fmoc‐amino acid building blocks couple to chain termini of H‐peptide‐nanostar; piperidine quenches excess amino acid and removes Fmoc; diafiltration washes all reaction by‐products through a membrane; purified H‐peptide‐nanostar is retained in the synthesizer, ready to repeat the cycle. Every process is analyzed in real time by UHPLC‐MS.
