InChI=1S/C17H15NO9S/c1-26-15-9-13(12(17(21)22)8-14(15)19)18-16(20)6-5-10-3-2-4-11(7-10)27-28(23,24)25/h2-9,19H,1H3,(H,18,20)(H,21,22)(H,23,24,25)