Using O=C(O)COc1ccc(Cl)cc1, Nc1c[nH]c(=O)[nH]c1=O to produce O=C(COc1ccc(Cl)cc1)Nc1c[nH]c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.