Using COC(=O)c1ccc2cccc(-c3cc4c([nH]3)CCNC4=O)c2n1 to produce O=C(O)c1ccc2cccc(-c3cc4c([nH]3)CCNC4=O)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.