InChI=1/C18H26O8/c1-2-3-5-8-12(19)9-6-4-7-10-14(20)25-11-13-15(21)16(22)17(23)18(24)26-13/h2,13,15-16,21-22H,1,3-11H2/t13?,15-,16+/s2