InChI=1S/C17H16O11S/c1-26-16-13(20)12(14(21)17(27-2)15(16)22)10(19)6-4-8-3-5-9(18)11(7-8)28-29(23,24)25/h3-7,18,20-22H,1-2H3,(H,23,24,25)