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a) Negative ion nano-electrospray ionization mass spectrum of 2-(fluoranthene-8-carbonyl)-benzoic acid. Ions of m/z greater than the [RCO2]− arise from sample impurities. b) Ion trap collision-induced dissociation of deprotonated 2-(fluoranthene-8-carbonyl)-benzoic acid. c) ETD spectrum derived from the reaction of the reagent anion [R]− of 2-(fluoranthene-8-carbonyl)-benzoic acid with triply protonated KGAILKGAILR.
