Using CCCc1c(O)ccc(C(C)=O)c1O, O=C(O)c1ccc(CCBr)cc1 to produce CCCc1c(OCCc2ccc(C(=O)O)cc2)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.