Using O=C([O-])[O-], CCOC(=O)c1cc(=O)c2ccc(OCCCCCBr)cc2o1 to produce O=C(O)c1cc(=O)c2ccc(OCCCCCOc3ccc4c(=O)ccoc4c3)cc2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.