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(A) MS2 and MS3 (negative ion) spectra of the mono-glucuronidated 6-gingerol, and MS2 (negative ion) spectrum of authentic 6-gingerol; (B) MS2 and MS3 (positive ion) spectra of mono-glucuronidated 6-gingerol, and MS2 (positive ion) spectrum of authentic 6-gingerol.
