InChI=1S/C18H22O9/c1-9(12(19)8-5-10-3-6-11(25-2)7-4-10)26-18-15(22)13(20)14(21)16(27-18)17(23)24/h3-9,13-16,18,20-22H,1-2H3,(H,23,24)/b8-5+