InChI=1S/C15H18O12S/c16-8-3-1-7(5-9(8)27-28(22,23)24)2-4-11(17)25-6-10-12(18)13(19)14(20)15(21)26-10/h1-5,10,12-16,18-21H,6H2,(H,22,23,24)/b4-2+