Using O, Cc1ccc2c(NC(=O)CCl)cc(NC(=O)CCl)c(O)c2n1 to produce Cc1ccc2c(n1)C(=O)C(NC(=O)CCl)=CC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.