InChI=1S/C28H22O8S/c29-21-13-20(14-22(30)15-21)27-26-19(9-6-17-7-10-24(11-8-17)36-37(32,33)34)12-23(31)16-25(26)35-28(27)18-4-2-1-3-5-18/h1-16,27-31H,(H,32,33,34)/b9-6-