Olanzapine N-oxide

Olanzapine N-oxide is an oxidation derivative of the antipsychotic drug olanzapine, featuring an N-oxide functional group at the piperidine nitrogen of the parent molecule. This structural modification introduces a polar, electron-withdrawing oxygen atom, altering the compound's physicochemical properties while retaining the core spirocyclic dibenzazepine-thiazole scaffold. The compound retains the 11-chloro substitution and spiro-fused thiazole ring critical to olanzapine's pharmacophore. Formed via oxidative degradation pathways during synthesis or storage, it serves as a key impurity reference standard for HPLC-based quantification of oxidation-related impurities in olanzapine drug substance batches.