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