InChI=1S/C16H12O9S/c17-12-11-9(6-10-15(12)23-7-22-10)24-14(8-4-2-1-3-5-8)16(13(11)18)25-26(19,20)21/h1-6,14,16-17H,7H2,(H,19,20,21)