Buspirone EP Impurity J, also designated Buspirone Open Ring Spirodimer Impurity, CAS 2726492-72-2, is a process-related dimeric impurity associated with the spirocyclic azapirone scaffold of buspirone. Its molecular formula, C34H52N6O5, and molecular weight, 624.81 g/mol, indicate a high-mass, nonvolatile species arising from synthetic coupling, ring-opening, or related degradative rearrangement pathways during manufacture or storage. Structural elucidation generally requires high-resolution LC-MS/MS with supporting NMR characterization, as conventional HPLC UV detection may be insufficient for trace-level assignment. Although not a nitrosamine, its presence is relevant to impurity profiling under pharmacopeial control and ICH Q3A principles.
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