Using O=C([O-])[O-], O=C(O)c1ccc(C(=O)N2CCCC2)c(Br)c1 to produce COC(=O)c1ccc(C(=O)N2CCCC2)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.