Using COC(F)(F)C(F)(F)C(=O)C(F)(F)C(F)(F)OC, OCCCl to produce COC(F)(F)C(F)(F)C1(C(F)(F)C(F)(F)OC)OCCO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.