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Negative ion electrospray product ion tandem mass spectra of the deprotonated molecules of A) 6-shogaol; B) 8-shogaol; and C) 10-shogaol. Neutral loss of 136 u due to benzylic cleavage of 6-, 8- and 10-shogaol resulted in the formation of the base peaks at m/z 139, 167 and 195, respectively.
