InChI=1S/C20H16O7/c21-9-3-1-7-8-2-4-10(22)17-12(24)6-14(26)20(27,18(8)17)19-13(25)5-11(23)16(9)15(7)19/h1-4,13-14,19,21-22,25-27H,5-6H2/t13-,14+,19+,20-/m1/s1