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