InChI=1S/C16H12O9S/c1-24-12-5-8(17)4-10-14(12)16(20)13-9(15(10)19)2-7(3-11(13)18)6-25-26(21,22)23/h2-5,17-18H,6H2,1H3,(H,21,22,23)