InChI=1/C20H17NO7/c1-7-9-3-2-4-11(22)13(9)16(24)14-10(7)5-8-6-12(23)15(19(21)27)18(26)20(8,28)17(14)25/h2-4,8,22-24,28H,5-6H2,1H3,(H2,21,27)/p-1/t8-,20+/m0/s1/fC20H16NO7/h23h,21H2/q-1 CA554340D39A1691