Using CCOC(=O)CCCOc1ccc(C2C3CC4CC(C3)CC2C4)cc1 to produce O=C(O)CCCOc1ccc(C2C3CC4CC(C3)CC2C4)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.