Using O=C(OCc1ccccc1)[C@H]1NCCC1Br, N[C@@H](CCC(=O)O)C(=O)O to produce N[C@@H](CCC(=O)O)C(=O)N1CCC(Br)[C@H]1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.