InChI=1S/C16H14O9S/c1-9(7-24-26(19,20)21)12(17)8-23-16-10-2-3-15(18)25-14(10)6-13-11(16)4-5-22-13/h2-6,12,17H,1,7-8H2,(H,19,20,21)