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Parthenolide (PTL) selectively ablates leukemia stem cells (LSCs). A series of PTL derivatives with modifications on C-14 of PTL was synthesized, and most of the derivatives showed high activities against HL-60 and KG1a. The most potent compound 6j exhibited IC50 values of 0.4 μM and 1.1 μM against KG1a and HL-60, respectively, which were 8.7 and 3.8 folds more potent than those of PTL, respectively...
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