Using O=C(OCc1ccccc1)N1CCN(C(=O)CBr)[C@H](CO)C1 to produce O=C(OCc1ccccc1)N1CCN2C(=O)COC[C@@H]2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.