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