Using COc1ccc(Oc2c(/C=C(/C(=O)[O-])c3ccccc3)sc3cc(OC)c(OC)cc23)cc1 to produce COc1ccc(Oc2c(CC(C(=O)O)c3ccccc3)sc3cc(OC)c(OC)cc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.