Using O=C(NC[C@H]1CCCN1)OCc1ccccc1, CCOC(=O)C(Br)C(=O)OCC to produce CCOC(=O)C(C(=O)OCC)N1CCC[C@@H]1CNC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.