Using C=C(COc1ccc(OC)cc1)c1ccc(Cl)c(Cl)c1, O=C([O-])O to produce COc1ccc(OCC2(c3ccc(Cl)c(Cl)c3)CO2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.