InChI=1S/C20H16O11S/c1-25-18-16-9(2-3-26-16)4-10-17(18)30-15-7-27-12-6-14-13(28-8-29-14)5-11(12)20(15,21)19(10)31-32(22,23)24/h2-6,15,19,21H,7-8H2,1H3,(H,22,23,24)