Budesonide EP Impurity H (CAS 313474-58-7) is a defined corticosteroid-related process and/or degradation impurity associated with the budesonide scaffold, with molecular formula C25H32O5 and molecular weight 412.52 g/mol. Its structural relationship to the parent glucocorticoid suggests origin from site-selective oxidation, acetal rearrangement, or synthetic intermediate carryover during esterification and deprotection steps. Because trace-level chromatographic resolution is often required, characterization commonly relies on LC-MS/MS, high-resolution LC-MS, and orthogonal HPLC with UV detection; NMR may be needed for structure assignment. In regulatory contexts, such impurities are controlled through pharmacopeial specifications and impurity profiling.
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