Buspirone Related Compound L, also listed as Buspirone EP Impurity L, is a chlorinated buspirone-derived process impurity identified by CAS 21098-11-3. With molecular formula C13H20ClNO2 and molecular weight 257.76 g/mol, it represents a structurally defined heteroatom-containing analog relevant to impurity profiling of buspirone hydrochloride materials. Its origin is typically associated with synthetic route side products or halogen-containing intermediates rather than simple oxidative degradation. Characterization and quantification generally require LC-MS/MS for selectivity, with complementary HPLC-UV or GC-MS confirmation when volatility and derivatization permit. As a defined organic impurity, it is assessed within pharmacopoeial and ICH impurity control frameworks.
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