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