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Negative ion electrospray product ion tandem mass spectra of the deprotonated molecules of A) 6-gingerol; B) 8-gingerol; and C) 10-gingerol. The product ion of m/z 193 and neutral loss of 194 u were observed as abundant fragmentation patterns in the tandem mass spectra of all gingerols due to characteristic fragmentation at C4-C5.
