Using CCOC(=O)C1(c2cc(OCC(F)(F)F)c(N)c(-c3ccc(C(F)(F)F)cc3)c2)CCCC1, Cl to produce CCOC(=O)C1(c2cc(OCC(F)(F)F)c(Cl)c(-c3ccc(C(F)(F)F)cc3)c2)CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.