Using COc1ccc2[nH]c3c(C)cc4c(c3c2c1)C(=O)N(CCNC(C)=O)C4=O to produce COc1ccc2[nH]c3c(C)cc4c(c3c2c1)C(=O)N(CCN)C4=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.