InChI=1S/C28H32N2O/c1-2-27(31)30(26-16-10-5-11-17-26)28(25-14-8-4-9-15-25)19-22-29(23-20-28)21-18-24-12-6-3-7-13-24/h3-17H,2,18-23H2,1H3