InChI=1S/C28H22O9S/c29-20-7-5-17(6-8-20)28-27(19-12-21(30)14-22(31)13-19)26-18(11-23(32)15-25(26)36-28)4-1-16-2-9-24(10-3-16)37-38(33,34)35/h1-15,27-32H,(H,33,34,35)/b4-1-