5-[Bis(2-chloroethyl)-amino]-1-methyl-1H-benzimidazole-2-butanoic Acid Hydrochloride; Cytostasan; Ribomustin; Treanda; 1H -Benzimidazole-2-butanoic acid, 5-[bis(2-chloroethyl)amino]-1-methyl-, Monohydrochloride; 4-{5-[Bis(2-chloroethyl)amino]-1-methyl-1H -benzimidazole-2-yl}butanoic Acid Monohydrochloride (USP);