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(A) Stability of compound 33 in various solutions. Compound 33 was incubated in CH3CN/H2O, MeOH/H2O, or cell culture media, and the % composition of 33 in the solutions was determined daily for 2 days by UPLC (ultraperformance liquid chromatography) and plotted. (B, C, D) UPLC/MS spectrum of 33, 6, and 31, respectively, after incubation for 2 days in cell culture media. Peaks are labeled with retention time followed by molecular weight.
