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