Using CCCCCC(Oc1ccc(C2=CCCCC2)cc1)C(=O)O, O=C(Cl)C(=O)Cl to produce CCCCCC(Oc1ccc(C2=CCCCC2)cc1)C(=O)Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.