InChI=1S/C19H21N3O2/c1-19(12-17(23)22(2)18(20)21-19)15-8-4-6-13(10-15)14-7-5-9-16(11-14)24-3/h4-11H,12H2,1-3H3,(H2,20,21)/t19-/m0/s1