InChI=1S/C18H19NO9S/c1-27-16-8-11(2-5-14(16)21)3-7-18(23)19-10-17(28-29(24,25)26)12-4-6-13(20)15(22)9-12/h2-9,17,20-22H,10H2,1H3,(H,19,23)(H,24,25,26)