InChI=1S/C16H16O9S/c1-16(20)7-10-12(19)5-9(17)6-13(10)24-15(16)8-2-3-11(18)14(4-8)25-26(21,22)23/h2-6,15,17-20H,7H2,1H3,(H,21,22,23)/t15?,16-/m1/s1