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