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On‐spot derivatization has been suggested for the modification of primary amine containing compounds for their analysis by thin‐layer chromatography hyphenated with matrix‐assisted laser desorption ionization mass spectrometry. The proposed approach was based on post‐chromatographic treatment of separated analytes inside the chromatographic zones on the thin‐layer chromatography plates by tris(2,6‐dimethoxyphenyl)methilium...