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. 2018 Aug 28;9:934. doi: 10.3389/fphar.2018.00934

Figure 1.

Figure 1

Typical UPLC-QTOF-MS/MS chromatograms of secondary metabolites in PMR. (A,D) RPMR; (B,E) PPMR1; (C,F) PPMR9; (A–C) negative mode; (D–F) positive mode. The peak numbers represent the same meanings as in Table 1.