Quetiapine EP Impurity N, also described as quetiapine dipiperazine diether impurity (free base), is a process-related structural variant of the dibenzothiazepine antipsychotic scaffold rather than a simple degradation product. CAS 1800291-86-4; molecular formula C29H41N5O3S; molecular weight 539.73 g/mol. The name indicates ether-linked dipiperazine substitution, consistent with alkylation or overreaction during synthesis or intermediate handling. Such impurities are typically monitored by reversed-phase LC with diode-array or LC-MS/MS confirmation, and may require high-resolution MS for trace characterization. Although not a classical genotoxic alert, its presence is assessed under impurity control and specification frameworks.
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