InChI=1/C20H18N2O5/c1-21(11-13-6-7-16-17(10-13)27-9-8-26-16)18(23)12-22-19(24)14-4-2-3-5-15(14)20(22)25/h2-7,10H,8-9,11-12H2,1H3 C12B8B444E6E8E6B