Using Cn1ncc2c(F)cc(F)cc21, CC(=O)c1cnc2ccc(Cl)nn12 to produce Cn1ncc2c(F)c(C(C)(O)c3cnc4ccc(Cl)nn34)c(F)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.