Using NCCN, CCC1(C)CC(=O)C(C)C(C)(CC)N1 to produce CCC1(C)CC(NCCNC2CC(C)(CC)NC(C)(CC)C2C)C(C)C(C)(CC)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.