InChI=1S/C14H12O9S2/c15-12-7-11(8-14(9-12)23-25(19,20)21)2-1-10-3-5-13(6-4-10)22-24(16,17)18/h1-9,15H,(H,16,17,18)(H,19,20,21)/b2-1+