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(a) Product ion spectrum from the MS3 experiment involving [M+H]+ + [FBDSA-2H]2- → [M+FBDSA-H]- → [M+◆]-→ products for M= KGAILKGAILR. (b) Ion trap CID MS/MS of the Schiff base product, [M+◆]-, formed in solution. (Note that the [M+FBDSA-H]- ion in Figure 1(b) was present after the isolation step but was not subjected to ion trap CID.)
