Using CNCC[C@H](c1ccccc1)N1C(=O)C(C)(C)c2ccccc21 to produce CNCC[C@H](c1ccccc1)N1CC(C)(C)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.