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