InChI=1S/C28H22O7S/c29-22-13-10-18(11-14-22)9-12-21-15-23(30)17-25-26(21)27(28(34-25)19-5-2-1-3-6-19)20-7-4-8-24(16-20)35-36(31,32)33/h1-17,27-30H,(H,31,32,33)/b12-9+