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Since introduction of sinapinic acid (SA) and α‐cyano‐4‐hydroxycinnamic acid as matrices, successful application of matrix‐assisted laser desorption/ionization mass spectrometry started for protein/polypeptides. Both show some limitations in short peptide analysis because matrix clusters are quite abundant. Cinnamics currently used are E‐cinnamics. Here, Z‐SA as matrix for peptides is studied and...