Eltrombopag Impurity 15 (CAS 376592-58-4) is a defined related substance of the small-molecule thrombopoietin receptor agonist eltrombopag, with molecular formula C13H8ClNO5 and molecular weight 293.66 g/mol. Its structure is consistent with a chlorinated, highly oxygenated aromatic degradation or synthetic intermediate impurity rather than a simple salt form. Such species are typically monitored because positional chlorine substitution and polyoxygenation can alter chromatographic behavior and impurity fate during oxidative stress studies. Due to low-level occurrence and potential structural similarity to the parent, detection commonly requires LC-MS/MS, high-resolution LC-MS, and orthogonal HPLC-UV methods under impurity profiling conditions.
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