InChI=1S/C18H19NO9S/c1-26-15-8-11(4-7-14(15)28-29(23,24)25)16-17(27-16)18(22)19-9-13(21)10-2-5-12(20)6-3-10/h2-8,13,16-17,20-21H,9H2,1H3,(H,19,22)(H,23,24,25)