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