Using C[C@@H](CCN1CCN(C(=O)OCc2ccccc2)CC1)NC(=O)OC(C)(C)C to produce C[C@@H](CCN1CCNCC1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.