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HPLC chromatograms of standard mixture (a, b) and XDKMT (c, d) by LC-UV/ELSD method
(a, c) refer to UV detection; (b, d) refer to ELSD. The concentrations (μg/ml) of the standards: 3: 9.42; 4: 11.9; 6: 9.42; 8: 13.3; 11: 8.51; 12: 6.19; 15: 63.3; 16: 12.7; 18: 80.7. Numbers of the compounds were the same as those in Fig. 1
