Terbutaline EP Impurity D (hydrobromide) (CAS 1797117-23-7) is the hydrobromide salt of 2-[benzyl(tert-butyl)amino]-1-(3,5-dihydroxyphenyl)ethanone (free base C19H23NO3, MW 313.39), an N-benzylated aminoketone analog related to the β2-adrenoceptor agonist terbutaline. As the impurity designated Impurity D in the European Pharmacopoeia (EP) monograph for terbutaline, it is used as a reference standard for the identification and quantification of this related substance in terbutaline APIs and finished formulations, supporting HPLC impurity profiling, method validation, and regulatory quality control.
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