Using CCOC(=O)C=C(c1ccc2cc[nH]c2c1)c1c[nH]c2ccccc12 to produce CCOC(=O)CC(c1ccc2cc[nH]c2c1)c1c[nH]c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.