Using C[C@@H](N)C(=O)OC(C)(C)C, CCOC(=O)C(CCBr)N=[N+]=[N-] to produce C[C@H](C(=O)OC(C)(C)C)N1CCC(N=[N+]=[N-])C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.