Empagliflozin Impurity 63, also designated Empagliflozin Benzylic keto Impurity or Empagliflozin Impurity G, CAS 2125472-55-9, is a chlorinated oxygenated process-related impurity of the C-glycoside SGLT2 inhibitor scaffold. With molecular formula C23H25ClO8 and molecular weight 464.89 g/mol, it is consistent with benzylic oxidation or ketone formation at the aryl-linked side chain during synthesis or storage. Its structural polarity and aromatic chromophore generally require LC-MS/MS, HPLC-DAD, and high-resolution MS for trace-level characterization, with NMR confirmation for assignment. It is not a nitrosamine class impurity and is not typically addressed under ICH M7 as a structural alert species.
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