InChI=1S/C18H18O11/c19-11(28-18-14(22)12(20)13(21)16(29-18)17(23)24)4-3-9-15(27-9)7-1-2-8-10(5-7)26-6-25-8/h1-5,9,12-16,18,20-22H,6H2,(H,23,24)/b4-3+