Using CN(Cc1ccccc1)C(=O)[C@H](Cc1ccccc1)NC(=O)[C@H](N)Cc1cn(C=O)c2ccccc12, C[C@@H](O)[C@H](NC(=O)OC(C)(C)C)C(=O)O to produce C[C@@H](O)[C@H](NC(=O)OC(C)(C)C)C(=O)N[C@H](Cc1cn(C=O)c2ccccc12)C(=O)N[C@@H](Cc1ccccc1)C(=O)N(C)Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.