Using CCOC(=O)C(CC1CC1)c1cc(OCC(F)(F)F)c(N)c(-c2ccc(C(F)(F)F)cc2)c1, Cl to produce CCOC(=O)C(CC1CC1)c1cc(OCC(F)(F)F)c(Cl)c(-c2ccc(C(F)(F)F)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.