InChI=1S/C23H26N2O3/c26-20-14-25(23(27)28-21-15-24-12-10-16(21)11-13-24)22(17-6-2-1-3-7-17)19-9-5-4-8-18(19)20/h1-9,16,20-22,26H,10-15H2/t20-,21?,22-/m0/s1