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Table 2 Elemental composition of major fragments in the MS spectra

From: Characterization and determination of six flavonoids in the ethnomedicine “Dragon’s Blood” by UPLC-PAD-MS

Peak RT (min) Compounds Formula Calculated (m/z) Observed (m/z) Error (mDa)
1 4.9 Dracorhodin C17H15O3 267.1016 267.1083 6.7
    C16H12O3 252.0781 252.0814 3.3
2 8.9 4,6-Dihydroxy-2-methoxy- 3-methyldihydrochalcone C17H18O4Na 309.1097 309.1098 0.1
   C17H19O4 287.1278 287.1274 −0.4
    C17H17O3 269.1172 269.1186 1.4
    C9H11O3 167.0703 167.0779 7.6
3 9.4 4,6-Dihydroxy-2-methoxy- 3-methylchalcone C17H16O4Na 307.0941 307.0940 −0.1
   C17H17O4 285.1121 285.1133 1.2
    C17H15O3 267.1016 267.1051 3.5
    C7H5O 105.0335 105.0385 5.0
4 10.1 (2S)-5,7-Dihydroxy- dihydroflavone C15H12O4Na 279.0628 279.0630 0.2
   C15H13O4 257.0808 257.0838 3.0
    C7H5O4 153.0182 153.0242 6.0
5 12.8 (2S)-5-Methoxyflavan-7-ol C16H16O3Na 279.0992 279.1017 2.5
    C16H17O3 257.1172 257.1188 1.6
    C8H9O3 153.0546 153.0616 7.0
6 13.4 (2S)-5-Methoxy-6-methyl- flavan-7-ol C17H18O3Na 293.1148 293.1152 0.4
   C17H19O3 271.1329 271.1341 1.2
    C9H11O3 167.0703 167.0782 7.9