Using COC(=O)[C@H](CCSC)NC(=O)[C@H](Cc1ccccc1)NC[C@@H](NC(=O)[C@@H]1CCC(=O)N1)C(C)C to produce CSCC[C@H](NC(=O)[C@H](Cc1ccccc1)NC[C@@H](NC(=O)[C@@H]1CCC(=O)N1)C(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.