Using O=C1CCC(=O)N1Br, CN1CC(c2ccc(NC(=O)OC(C)(C)C)cc2)CN(C)C1=O to produce CN1CC(c2ccc(N)c(Br)c2)CN(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.