7-Bromo Darifenacin

7-Bromo Darifenacin is a benzothiazole-containing quinuclidine derivative featuring a bromine substituent at the 7-position of the fused aromatic ring system. This substitution introduces an electron-withdrawing halogen adjacent to the thiazole nitrogen, altering the compound's lipophilicity and metabolic stability compared to the parent drug. The core scaffold retains the piperidine-like tertiary amine essential for muscarinic receptor interaction. Synthetically, this impurity arises via bromination of the aromatic ring during Darifenacin API synthesis. Serves as an HPLC reference standard for quantifying 7-bromo impurity in Darifenacin formulations.