Ibuprofen EP Impurity D, CAS 938-94-3, corresponde al ácido 2-(4-metilfenil)propanoico, un isómero posicional de ibuprofeno con fórmula C10H12O2 y peso molecular de 164,2 g/mol. Esta impureza de ácido arilpropiónico puede originarse por formación del isómero durante la síntesis o por control insuficiente de etapas de alquilación regioselectiva en la fabricación. No es una nitrosamina ni una especie mutagénica, pero su presencia es relevante para el perfil de impurezas y la conformidad compendial. La identificación concluyente suele requerir HPLC con detección por arreglo de diodos, LC-MS/MS para confirmación de masa y, cuando procede, GC-MS tras derivatización.
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