InChI=1S/C15H18O11S/c16-11(24-7-10-12(17)13(18)14(19)15(20)25-10)6-3-8-1-4-9(5-2-8)26-27(21,22)23/h1-6,10,12-15,17-20H,7H2,(H,21,22,23)/b6-3+