Using NC(=O)CBr, C[C@@H]1CN(C(=O)OC(C)(C)C)CCN1 to produce C[C@@H]1CN(C(=O)OC(C)(C)C)CCN1CC(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.