Using CC(=O)OC(C)=O, NC(=O)N1C(=O)Cc2cc(Cl)ccc21 to produce CC(=O)C1C(=O)N(C(N)=O)c2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.