InChI=1S/C20H14O7S/c1-25-20-18(21)17-14(11-5-8-13(9-6-11)27-28(22,23)24)10-7-12-3-2-4-15(16(12)17)19(20)26-20/h2-10,19H,1H3,(H,22,23,24)