InChI=1S/C18H13NO7S/c1-19-12-6-9-4-2-3-5-10(9)15-14(12)11(7-13-17(15)25-8-24-13)16(18(19)20)26-27(21,22)23/h2-7,16H,8H2,1H3,(H,21,22,23)