4-(5-Amino-1-methyl-1H-benzoimidazol-2-yl)-butyric acid isopropyl ester

4-(5-Amino-1-methyl-1H-benzoimidazol-2-yl)-butyric acid isopropyl ester is used mainly as a crucial intermediate in the synthesis of the cancer drug Bendamustine, an alkylating agent for leukemia and lymphomas, serving as a precursor to the active drug and also as a reference standard or impurity in pharmaceutical quality control.