InChI=1S/C20H20N2O9S/c1-29-15-8-10(2-4-13(15)31-32(26,27)28)18-20(25,19(23)24)17-14(30-18)5-3-12-16(17)11(6-7-21)9-22-12/h2-5,8-9,18,22,25H,6-7,21H2,1H3,(H,23,24)(H,26,27,28)