Fig. 1.
ESI mass spectra of AcYPFF ([M + H]+ 614.0, [M + Na]+ 635.9, [M + K]+ 652.0, [2 M + Na]+ 1248.9 and [M-H]− 611.9, [M-H + HCl]− 647.8, [M-H + CF3COOH]− 725.8)
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