Using O=C(O)Cc1cccc(C(=O)c2ccccc2)c1, CCOC(=O)Cc1cccc(Oc2ccccc2)c1 to produce CCOC(=O)Cc1cccc(C(=O)c2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.