Using O=C(CBr)c1ccncc1, O=C(O)Cc1ccc(OCc2ccccc2)cc1 to produce O=C(Cc1ccc(OCc2ccccc2)cc1)OCC(=O)c1ccncc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.