Using O=C([O-])[O-], Cc1c(Cl)[nH]n(-c2cc(Cl)cc(Cl)c2)c1=O to produce CC1(O)C(=O)N(c2cc(Cl)cc(Cl)c2)N=C1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.