Using C[C@H](NC(=O)[C@H](C)N(C)C(=O)[C@@H]1CCCN1C(=O)OC(C)(C)C)C(=O)N1CCC[C@H]1C(=O)OC[C@H](NC(=O)OCc1ccccc1)C(=O)OCC(=O)c1ccccc1 to produce C[C@H](NC(=O)[C@H](C)N(C)C(=O)[C@@H]1CCCN1C(=O)OC(C)(C)C)C(=O)N1CCC[C@H]1C(=O)OC[C@H](NC(=O)OCc1ccccc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.