Bendamustine Impurity 23 HCl (Bendamustine N-Alkylated Impurity HCl) Bendamustine Impurity 23 HCl Bendamustine Impurity 8 Bendamustine impurity 26/Bendamustine N-Alkylated Impurity HCl/ Deschloroethyl Bendamustine HCl/4-(5-((2-chloroethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoic acid hydrochloride 4-(5-((2-chloroethyl)amino)-1-methyl Bendamustine USP Related Compound D Bendamustine Related Compound D 1H-Benzimidazole-2-butanoic acid, 5-[(2-chloroethyl)amino]-1-methyl-, hydrochloride (1:1)