InChI=1S/C20H18O8/c1-23-10-5-4-9(21)15-17(22)16-11(24-2)7-12-14(19(16)28-18(10)15)8-6-13(25-3)27-20(8)26-12/h4-5,7-8,13,20-21H,6H2,1-3H3/t8-,13+,20-/m0/s1