InChI=1S/C17H16O9S/c1-25-11-5-2-10(3-6-11)4-7-13(18)16-15(20)8-14(19)12(17(16)21)9-26-27(22,23)24/h2-8,19-21H,9H2,1H3,(H,22,23,24)