Using CC(C)(C)OC(=O)CC[C@H](NC(=O)OCc1ccccc1)C(=O)N1CCN(C(=O)OC2CCC2)CC1 to produce CC(C)(C)OC(=O)CC[C@H](N)C(=O)N1CCN(C(=O)OC2CCC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.