Using CCOC(=O)C(Br)C(=O)OCC, CC(=O)c1ccc(C(F)(F)F)cc1C(=O)O to produce Cc1c(C(=O)O)oc(=O)c2cc(C(F)(F)F)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.