Metoprolol EP Impurity D, also designated Metoprolol Related Compound E, is a defined process-related impurity associated with the beta-adrenoceptor blocker metoprolol. CAS 62572-90-1 corresponds to a neutral organic species with molecular formula C12H18O4 and molecular weight 226.27 g/mol. Structurally, it represents a hydroxylated and oxidized side-chain derivative rather than a nitrosamine or other recognized mutagenic scaffold. Its occurrence is typically linked to synthetic side reactions or oxidative transformation during manufacture and storage. Identification and trace-level quantification generally require orthogonal LC-MS/MS, HPLC-UV, and, when needed, NMR confirmation under pharmacopeial and ICH impurity control expectations.
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