InChI=1S/C16H14O12S2/c17-11-3-2-10(8-12(11)18)15-16(28-30(22,23)24)27-13-4-1-9(7-14(13)26-15)5-6-25-29(19,20)21/h1-8,15-18H,(H,19,20,21)(H,22,23,24)/b6-5+