InChI=1S/C18H23N3O2/c1-11(2)8-16-17(22)20-15(18(23)21(16)3)9-12-10-19-14-7-5-4-6-13(12)14/h4-7,10-11,15-16,19H,8-9H2,1-3H3,(H,20,22)/t15-,16+/m0/s1