Ibuprofen EP Impurity D, CAS 938-94-3, corresponds to 2-(4-Methylphenyl)propanoic acid, a positional isomer of ibuprofen with formula C10H12O2 and molecular weight 164.2 g/mol. This arylpropionic acid impurity may arise from synthetic isomer formation or incomplete control of regioselective alkylation steps during manufacture. It is not a nitrosamine or mutagenic species, but its presence is relevant to impurity profiling and compositional conformance in pharmacopeial materials. Definitive identification typically relies on HPLC with diode array detection, LC-MS/MS for mass confirmation, and GC-MS when volatility or derivatization permits structural discrimination.
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