(S)-2-(1-(3-(2-Bromoethyl)-4-hydroxyphenethyl)pyrrolidin-3-yl)-2,2-diphenylacetamide Hydrobromide is an impurity compound of Darifenacin (D193400). Darifenacin is used as a medication for the treatment of urinary incontinence. It works by blocking the M3 muscarinic receptor.