InChI=1S/C17H12N2O7S/c20-17(21)13-7-11-10-3-1-2-4-12(10)18-15(11)16(19-13)14-6-5-9(26-14)8-25-27(22,23)24/h1-7,18H,8H2,(H,20,21)(H,22,23,24)