Using Cc1cccc(C)c1O, O=C(Cl)CC(c1ccccc1)c1ccccc1 to produce Cc1cccc(C)c1OC(=O)CC(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.