InChI=1S/C18H18O10S/c1-25-13-7-12(20)14-15(21)11(8-27-18(14)17(13)26-2)16(28-29(22,23)24)9-3-5-10(19)6-4-9/h3-7,11,16,19-20H,8H2,1-2H3,(H,22,23,24)