InChI=1S/C17H16O10S/c1-25-16-13(19)12(14(20)17(26-2)15(16)21)11(18)7-6-9-4-3-5-10(8-9)27-28(22,23)24/h3-8,19-21H,1-2H3,(H,22,23,24)