Using CC(=O)OC(C)=O, CCCCn1c(=O)c2[nH]c(N)nc2n(CCCC)c1=O to produce CCCCn1c(=O)c2[nH]c(NC(C)=O)nc2n(CCCC)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.