Using COc1cc(-c2cccc(Cl)c2)c2cc(C(O)c3ccoc3)ccc2n1 to produce COc1cc(-c2cccc(Cl)c2)c2cc(C(=O)c3ccoc3)ccc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.