InChI=1S/C19H17NO8/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/h1-7,14-17,19-20,22-24H,(H,25,26)