Using O=C(CBr)c1ccc(Cl)cc1Cl, CC(O)(O)CCc1ccc(Cl)cc1Cl to produce Clc1ccc(CCC2COC(CBr)(c3ccc(Cl)cc3Cl)O2)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.