InChI=1S/C20H20N2O3/c1-9(23)20-17(24)16(22-18(20)25)11-8-21-13-6-4-5-10-7-12(19(20,2)3)15(11)14(10)13/h4-6,8,12,15-16,21H,7H2,1-3H3,(H,22,25)/t12-,15+,16-,20+/m0/s1