InChI=1S/C17H18N2O9S/c1-26-17(18)29-13-8(6-4-2-3-5-7(6)19-13)15(25)28-16-11(22)9(20)10(21)12(27-16)14(23)24/h2-5,9-12,16,18-22H,1H3,(H,23,24)