InChI=1S/C18H16O11/c1-25-11-4-7-8(26-11)3-2-6-9(5-10(19)28-15(6)7)27-18-14(22)12(20)13(21)16(29-18)17(23)24/h2-5,12-14,16,18,20-22H,1H3,(H,23,24)