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