Using CCOC(=O)c1nc(CCl)n(-c2ccccc2C(=O)c2ccccn2)n1 to produce O=C(O)c1nc(CCl)n(-c2ccccc2C(=O)c2ccccn2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.