Buspirone EP Impurity F, also designated buspirone open ring dimer impurity, is a process-related dimeric degradant associated with structural opening of the azaspirobuspirone scaffold during synthesis or subsequent stress exposure. CAS 2512210-24-9 corresponds to C33H51N9O3 with a molecular weight of 621.82 g/mol. The impurity contains multiple basic nitrogen atoms and a noncyclized diamine-like framework, which can alter chromatographic behavior and mass spectrometric fragmentation. Trace-level characterization generally requires LC-MS/MS for selectivity, often complemented by high-resolution MS and orthogonal reversed-phase or ion-pair LC methods. Its appearance is relevant to impurity profiling under pharmacopeial and ICH impurity control principles.
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