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Validation and characterization of sulfated syringic acid (36) in a human urine sample. (A) Representative co-injection experiments. The top chromatogram represents the EIC of the synthesized compound 36, the middle chromatogram the EIC of the co-injection experiment of the synthetic and natural molecule 36, and the bottom chromatogram is EIC for 36; (B) Two fragmentation pattern for syringic acid sulfate (36) (10 eV and 30 eV); (C) Proposed fragmentation of 36.
