Using COC(=O)[C@@]1(c2ccc3ccccc3c2)CC1(c1ccccc1)c1ccccc1 to produce O=C(O)[C@@]1(c2ccc3ccccc3c2)CC1(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.