InChI=1S/C19H19NO8/c21-7-8-5-10-9-3-1-2-4-11(9)20-13(10)12(6-8)27-19-16(24)14(22)15(23)17(28-19)18(25)26/h1-6,14-17,19-24H,7H2,(H,25,26)