InChI=1S/C18H21NO9S/c1-27-17-8-12(4-7-14(17)20)15(21)9-18(23)19-10-16(22)11-2-5-13(6-3-11)28-29(24,25)26/h2-8,15-16,20-22H,9-10H2,1H3,(H,19,23)(H,24,25,26)