Using CC(C)(C)OC(=O)NCC(=O)N[C@@H]1C[C@@H](C(=O)N2C[C@H](NC(=O)[C@H](O)CCc3ccccc3)C[C@H]2C(=O)Nc2cnc3ccccc3c2)N(C(=O)OC(C)(C)C)C1 to produce N[C@H]1CN[C@H](C(=O)N2C[C@H](NC[C@H](O)CCc3ccccc3)C[C@H]2C(=O)Nc2cnc3ccccc3c2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.