InChI=1/C28H22O9S/c29-20-9-17(10-21(30)14-20)2-1-16-3-8-26-25(11-16)27(19-12-22(31)15-23(32)13-19)28(36-26)18-4-6-24(7-5-18)37-38(33,34)35/h1-15,27-32H,(H,33,34,35)/b2-1+