Using CC(C)[C@H](NC(=O)[C@H](CCC(=O)OC(C)(C)C)NC(=O)OCc1ccccc1)C(=O)N[C@H](C(=O)N1CCC[C@H]1C(=O)OCc1ccccc1)C(C)C to produce CC(C)[C@H](NC(=O)[C@@H](N)CCC(=O)OC(C)(C)C)C(=O)N[C@H](C(=O)N1CCC[C@H]1C(=O)O)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.