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. Author manuscript; available in PMC: 2014 Feb 5.
Published in final edited form as: Anal Chem. 2013 Jan 7;85(3):1727–1733. doi: 10.1021/ac3030398

Figure 1.

Figure 1

Negative ion electrospray product ion mass spectrum (−75 eV CID ) of [M-H]− precursor of glyceollin (m/z 337). Under these higher-energy conditions, the product ion at m/z 148 appears in high abundance.