Using CCOC(=O)c1c(C(F)(F)F)nc(OC)c(COCCOC)c1OC, Cl to produce CCOC(=O)c1c(C(F)(F)F)nc(OC)c(CCl)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.