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Considering the capability of catechins to create bimolecular noncovalent complexes, in our research, the interacting with each other of catechins and 5FU was studied by various size spectrometric approaches. The ESI(+) and ESI(-) spectra of [5FU-catechin] mixtures had been studied, showing the synthesis of protonated and deprotonated bimolecular complexes, whose nature was confirmed by MS/MS experiments (product and precursor ion scans). To exclude the possible origin of these