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