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