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Negative ion electrospray product ion tandem mass spectra with CID of the deprotonated monoglucuronides A) MG5 of isoliquiritigenin (note that MG3 and MG4 produced identical tandem mass spectra); and B) MG1 of liquiritigenin (note that the tandem mass spectrum of MG2 was identical). [Gluc]− represents the deprotonated molecule of glucuronic acid. A− and B− are fragment ions corresponding to the A-ring and B-ring, respectively (see ring structures in Figure 1).
