4-(4-((2-((4-(4-((2-((4-(4-(bis(2-chloroethyl)amino)phenyl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)phenyl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)phenyl)butanoic acid
4-(4-((2-((4-(4-((2-((4-(4-(bis(2-chloroethyl)amino)phenyl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)phenyl)butanoyl)oxy)ethyl)(2-chloroethyl)amino)phenyl)butanoic acid