InChI=1S/C20H16O7/c21-9-4-2-8-7-1-3-10(22)14-12(7)16(18(25)19(26)17(14)24)20(27)6-5-11(23)13(9)15(8)20/h1-4,16,18-19,21-22,25-27H,5-6H2/t16-,18-,19+,20-/m1/s1