Using O=C1c2cccc(O)c2C(=O)c2c(Cl)ccc(Cl)c21, Cc1cc(C)c(CCl)c(C)c1 to produce Cc1cc(C)c(COc2cccc3c2C(=O)c2c(Cl)ccc(Cl)c2C3=O)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.