Using O=C1C=C(NC(=O)C(=O)c2cn(Cc3ccc(Cl)cc3)c3ccccc23)CO1, CI to produce CN(C(=O)C(=O)c1cn(Cc2ccc(Cl)cc2)c2ccccc12)C1=CC(=O)OC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.