InChI=1/C20H18N2O5/c1-21(15-9-8-13-6-4-5-7-14(13)10-15)20(23)16-11-18(26-2)19(27-3)12-17(16)22(24)25/h4-12H,1-3H3 3D72481F6FDBCFB2