Using O=C(O)CCl, Cc1ncc2cc(-c3c(Cl)cccc3Cl)c(N)nc2n1 to produce Cc1ncc2cc(-c3c(Cl)cccc3Cl)c(NC(=O)CCl)nc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.