InChI=1S/C19H18N2O3/c1-11-9-21(11)14-8-15(23)18-16(19(14)24)13(10-22)17(20(18)2)12-6-4-3-5-7-12/h3-8,11,22H,9-10H2,1-2H3/t11-,21+/m1/s1