InChI=1S/C18H25BrN2O5/c1-26-18(24)15(12-13-8-10-14(19)11-9-13)20-16(22)6-4-2-3-5-7-17(23)21-25/h8-11,15,25H,2-7,12H2,1H3,(H,20,22)(H,21,23)/t15-/m0/s1