Using CC(=O)NC12CC3(NC(C)=O)CC(NC(C)=O)(C1)CC(NC(C)=O)(C2)C3 to produce NC12CC3(N)CC(N)(C1)CC(N)(C2)C3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.