InChI=1S/C19H20O9S/c1-10(2)9-14(21)27-19(3,4)18-17(28-29(22,23)24)15-12(25-18)7-5-11-6-8-13(20)26-16(11)15/h5-9,17-18H,1-4H3,(H,22,23,24)