InChI=1S/C17H14O10S/c1-24-11-5-8(3-4-10(11)27-28(21,22)23)9-7-26-12-6-13(25-2)16(19)17(20)14(12)15(9)18/h3-7,19-20H,1-2H3,(H,21,22,23)