InChI=1S/C20H16O7S/c1-25-15-8-11-9-16-20(26-16)14-7-6-13(18(17(11)14)19(15)21)10-2-4-12(5-3-10)27-28(22,23)24/h2-7,9,15-16,20H,8H2,1H3,(H,22,23,24)