InChI=1S/C19H17NO9/c21-11-6-7(5-9-8-3-1-2-4-10(8)20-12(9)11)18(27)29-19-15(24)13(22)14(23)16(28-19)17(25)26/h1-6,13-16,19-24H,(H,25,26)