InChI=1S/C28H34N2O2/c1-4-32-28(25-16-10-6-11-17-25,26-18-12-7-13-19-26)27(31)30(3)23-22-29(2)21-20-24-14-8-5-9-15-24/h5-19H,4,20-23H2,1-3H3