InChI=1S/C19H19NO8/c1-7-4-10-9-6-8(2-3-11(9)20-13(10)12(21)5-7)27-19-16(24)14(22)15(23)17(28-19)18(25)26/h2-6,14-17,19-24H,1H3,(H,25,26)