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