Using O=C(O)c1ccn(-c2cccc3cccnc23)c1, O=C(Cl)C(=O)Cl to produce O=C(Cl)c1ccn(-c2cccc3cccnc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.