InChI=1S/C20H22N2O4/c1-9(23)13-18(25)16-15-11(20(2,3)22(16)19(13)26)8-10-6-5-7-12(21-4)14(10)17(15)24/h5-7,11,15-16,21,25H,8H2,1-4H3/t11-,15+,16+/m1/s1