Using COC(=O)c1cccc2ccn(Cc3ccc(-c4ccccc4)cc3)c12 to produce O=C(O)c1cccc2ccn(Cc3ccc(-c4ccccc4)cc3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.