InChI=1/C19H19N3O2/c23-18-15-8-4-7-14-9-10-22(16(12-20-18)17(14)15)19(24)21-11-13-5-2-1-3-6-13/h1-8,16H,9-12H2,(H,20,23)(H,21,24)/t16-/m1/s1/f/h20-21H 5DD49BD0C6DE5CE8