InChI=1S/C16H21BrN2O5/c1-4-19-12(20)7-8-16(19,22)9-18-15(21)13-11(23-2)6-5-10(17)14(13)24-3/h5-6,22H,4,7-9H2,1-3H3,(H,18,21)/t16-/m1/s1