Using O=C1CCC(=O)O1, c1cc2ccc3ccc4ccc5ccc6ccc1c1c2c3c4c5c61 to produce O=C(O)CCC(=O)c1cc2ccc3ccc4ccc5ccc6ccc1c1c6c5c4c3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.