Using O=C(Cl)CBr, CNc1ccc(OCC(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](Cc2ccccc2)[C@H](O)C(=O)N2CCC[C@H]2C(=O)NC(C)(C)C)cc1 to produce CN(C(=O)CBr)c1ccc(OCC(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](Cc2ccccc2)[C@H](O)C(=O)N2CCC[C@H]2C(=O)NC(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.