1-Methyl-5-(4-morpholinyl)-1H-benzimidazole-2-butanoic Acid Ethyl Ester is an intermediate in the synthesis of 4-(1-Methyl-5-morpholino-1H-benzo[d]imidazol-2-yl)butanoic Acid (Bendamustine Impurity 27) (M234490), which is an impurity of Bendamustine (B132500), which is used as an anticancer drug.