2-[2-[3-[3-[3-[bis[3-[2-[2-(3-decylsulfanyl-2-methylpropanoyl)oxyethyldisulfanyl]ethoxy]-3-oxopropyl]amino]propyl-methylamino]propyl-[3-[2-[2-(3-decylsulfanyl-2-methylpropanoyl)oxyethyldisulfanyl]ethoxy]-3-oxopropyl]amino]propanoyloxy]ethyldisulfanyl]ethyl 3-decylsulfanyl-2-methylpropanoate