Using COC(=O)C(CCBr)Oc1cc(-n2c(=O)cc(C(F)(F)F)n(C)c2=O)c(F)cc1Cl to produce COC(=O)C1(Oc2cc(-n3c(=O)cc(C(F)(F)F)n(C)c3=O)c(F)cc2Cl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.