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RATIONALEChemical derivatization is a very promising technique for improving analysis of peptides by mass spectrometry (MS). In this study, a novel kind of imidazolium‐based aromatic quaternary ammonium tag, 1‐[3‐[(2‐iodo‐1‐oxoethyl)amino]propyl]‐3‐butylimidazolium bromide (IPBI), designed with strong gas‐phase basicity and a permanent positive charge, was firstly synthesized and further used for...
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