InChI=1S/C20H20N2O3/c1-10-8-14(23)22-19(25-10)16-12(20(22,2)3)9-11-6-5-7-13-15(11)17(16)18(24)21(13)4/h5-7,9-10,19H,8H2,1-4H3/t10-,19-/m0/s1