Using C1COCCO1, O=C(Nc1cccc(-c2ccco2)c1)c1ccc2c(Cl)nnc(Cl)c2c1 to produce O=C(Nc1cccc(-c2ccco2)c1)c1ccc2c(Cl)n[nH]c(=O)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.