Using [OH-], CCOC(=O)c1cc2c(Cl)c(Cl)ccc2[nH]1 to produce O=C(O)Cc1c(C(=O)c2ccccc2)[nH]c2ccc(Cl)c(Cl)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.