InChI=1S/C18H18O9S/c1-22-11-6-4-3-5-10(11)12-7-14(27-28(19,20)21)16-13(26-12)8-15-17(18(16)23-2)25-9-24-15/h3-6,8,12,14H,7,9H2,1-2H3,(H,19,20,21)