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HPLC/UV chromatogram at 280 nm and HPLC-MS/MS data of three compounds.
| No. | Compound | t R a | X − b | MS2 of X− |
|---|---|---|---|---|
| I | a | 19.75 | 359.2 | 197, 198, 161 |
| II | b | 27.36 | 577.5 | 451, 425, 407, 289, 163, 161, 125 |
| III | c | 32.09 | X | 451, 425, 407, 289, 287, 125 |
HPLC = high-performance liquid chromatography; MS2 = tandem mass spectrometry.
tR represents for retention time in minutes.
X− represents for molecular ion (M–H)−.
