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Tandem ESI-MS/MS product-ion mass spectrum for 5 eV CID of the mixed and 20 positively charged supramolecule naproxen--- [PAMAM + 20H]+20---ibuprofen. Because the binding constant of naproxen at m/z 231 to PAMAM is stronger than ibuprofen, the protonated ibuprofen fragment ion at m/z 207 is formed to a greater extent.
