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. 2019 Jan 28;242:111713. doi: 10.1016/j.jep.2019.01.037

Table 2.

[M–H]- and MS2 ions of peaks 2–4 in negative mode.

Peak [M-H]- (m/z) MS2ions (m/z) Identified compounds Ref.
peak 2 485.12 467.31, 423.19, 393.38 2α,19α-dihydroxy-3-oxo-urs-12-en-28-oic acid (Tan et al., 2015, Wu et al., 2013)
peak 3 633.27 487.06 ([M–H–C9H6O2]-) 3-O-trans-p-coumaroyltormentic acid (Cao et al., 2016, Tan et al., 2015, Wang et al., 2017, Wu et al., 2013)
peak 4 633.15 487.12 ([M–H–C9H6O2]-) 3-O-cis-p-coumaroyltormentic acid (Cao et al., 2016, Tan et al., 2015, Wang et al., 2017, Wu et al., 2013)