Using O=C(O)C1CC1, CC(C)Nc1nnc(-c2ccc3[nH]cc(N)c3c2)o1 to produce CC(C)Nc1nnc(-c2ccc3[nH]cc(NC(=O)C4CC4)c3c2)o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.