Using O=C([O-])[O-], C=CCc1cc2c(=O)c3c(F)cccc3oc2c(Cl)c1O to produce O=C(O)C1Cc2cc3c(=O)c4c(F)cccc4oc3c(Cl)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.