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MS/MS spectra of S-alkylated hedyotide B2 doubly S-tagged with IAA and NEM. A–D show the MS/MS spectra of S-alkylated derivatives of intermediate species in peaks 2, 3, 4, and 6, respectively. Peak 5 contains isoforms of intermediate species in peaks 4 and 6 with identical MS/MS spectra and was not shown here.
