Using C[C@@H](O)[C@H](N)C(=O)N[C@H](Cc1cn(C=O)c2ccccc12)C(=O)N[C@@H](Cc1ccccc1)C(=O)N(C)Cc1ccccc1, CC(C)(C)OC(=O)NCCC(=O)O to produce C[C@@H](O)[C@H](NC(=O)CCNC(=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.