Using OC1=C(O)[C@H](O)[C@@H]2OC[C@H]1O2, COc1cc(OC)cc(C(=O)O)c1 to produce COc1cc(OC)cc(C(=O)O[C@@H]2C=C[C@H]3CO[C@@H]2O3)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.