[3,4,5-Tribenzoyloxy-6-[2-[2-[2-[3-[2-[6-[[2,2-bis(octadeca-9,12-dienyl)-1,3-dioxolan-4-yl]methyl-methylamino]hexanoylamino]-3-[3-oxo-3-[2-[2-[2-[3,4,5-tribenzoyloxy-6-(benzoyloxymethyl)oxan-2-yl]oxyethoxy]ethoxy]ethylamino]propoxy]-2-[[3-oxo-3-[2-[2-[2-[3,4,5-tribenzoyloxy-6-(benzoyloxymethyl)oxan-2-yl]oxyethoxy]ethoxy]ethylamino]propoxy]methyl]propoxy]propanoylamino]ethoxy]ethoxy]ethoxy]oxan-2-yl]methyl benzoate