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(a,b) The MS and MS/MS spectra of a fengycin A derivative from [M + H]+ 1449.7859. (c,d) The MS and MS/MS spectra of a fengycin B derivative from [M + H]+ 1419.8343. (e,f) Illustration of the identical product ions derived from fengycin A and fengycin B, respectively.
