InChI=1S/C18H22O9/c1-25-12-6-3-10(4-7-12)2-5-11(19)8-9-26-18-15(22)13(20)14(21)16(27-18)17(23)24/h2-7,13-16,18,20-22H,8-9H2,1H3,(H,23,24)/b5-2+