Using COC(=O)CC(=O)OC, O=Cc1ccc(OCCOc2ccc3ccccc3c2)cc1 to produce COC(=O)C(=Cc1ccc(OCCOc2ccc3ccccc3c2)cc1)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.