InChI=1S/C19H13NO7S/c21-19-18(27-28(22,23)24)15-11-4-2-1-3-10(11)14-13-9(5-6-20(19)16(13)15)7-12-17(14)26-8-25-12/h1-4,7,18H,5-6,8H2,(H,22,23,24)