InChI=1S/C20H19NO8S/c1-25-16-4-3-11-5-15-12-6-17-18(28-10-27-17)7-13(12)19(29-30(22,23)24)9-21(15)8-14(11)20(16)26-2/h3-7,19H,8-10H2,1-2H3,(H,22,23,24)