InChI=1S/C18H17NO11S/c1-28-12-7-9(3-5-11(12)30-31(25,26)27)4-6-14(20)19-10-8-13(29-2)16(21)17(22)15(10)18(23)24/h3-8,21-22H,1-2H3,(H,19,20)(H,23,24)(H,25,26,27)