Olanzapine Impurity 3

Olanzapine Impurity 3 is a thiazole-substituted derivative arising from synthetic pathway divergence during API synthesis. It features a 1,2-benzisothiazole ring fused to the piperazine core, with a methylpiperidinyl side chain. The compound exhibits a quaternary ammonium center at the piperazine nitrogen, conferring a permanent positive charge. This impurity serves as a critical HPLC reference standard for quantifying process-related deviations in olanzapine formulation batches.