InChI=1S/C20H29BrN2O4/c1-4-5-6-17(12-24)22-19(25)18(11-14(2)3)23-20(26)27-13-15-7-9-16(21)10-8-15/h7-10,12,14,17-18H,4-6,11,13H2,1-3H3,(H,22,25)(H,23,26)/t17-,18-/m0/s1