InChI=1S/C23H28N2O/c1-25-18-8-7-12-21(25)16-15-20-11-5-6-13-22(20)24-23(26)17-14-19-9-3-2-4-10-19/h2-6,9-11,13-14,17,21H,7-8,12,15-16,18H2,1H3,(H,24,26)/b17-14+/t21-/m0/s1