Buspirone EP Impurity I, also referred to as buspirone chlorobuspirone, is a chlorinated process-related impurity associated with the azaspirodecanedione anxiolytic buspirone. CAS 2725354-99-2 corresponds to C21H30ClN5O2, molecular weight 419.95 g/mol. The presence of chlorine indicates a halogenated synthetic byproduct or substitution product formed during route-dependent intermediate conversion or side-reaction chemistry. Its chromatographic resolution commonly requires reversed-phase HPLC with LC-MS/MS or high-resolution MS confirmation, and structural assignment may be supported by NMR. Because it is a defined impurity rather than a degradant class such as a nitrosamine, its monitoring is guided by impurity profiling and specification control under pharmaceutical regulatory expectations.
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