InChI=1S/C18H20O8S/c1-11-16(20)15(14(19)9-8-12-6-4-3-5-7-12)17(21)13(18(11)25-2)10-26-27(22,23)24/h3-7,20-21H,8-10H2,1-2H3,(H,22,23,24)