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