InChI=1S/C19H18O11S/c1-26-11-6-10-13(19(29-4)17(11)27-2)16(22)12-9(15(10)21)5-8(7-30-31(23,24)25)14(20)18(12)28-3/h5-6,20H,7H2,1-4H3,(H,23,24,25)