2-(5-{2-[2-(5-{3-[5-(2-dimethylamino-pentyl)-tetrahydro-furan-2-yl]-2-hydroxy-1-methyl-butyl}-tetrahydro-furan-2-yl)-propionyloxy]-1-methyl-pentyl}-tetrahydro-furan-2-yl)-propionic acid benzyl ester