InChI=1S/C19H17NO9S/c1-20-10-5-3-2-4-9(10)16(22)13-11(21)6-12-14(15(13)20)17(23)18(29-12)19(7-27-19)8-28-30(24,25)26/h2-6,17-18,21,23H,7-8H2,1H3,(H,24,25,26)