Using CSCC[C@H](NC(=O)OCc1ccccc1)C(=O)N[C@H]1CC[C@@H](NC(=O)OC(C)(C)C)C[C@H]1CS(C)(=O)=O to produce CC(C)(C)OC(=O)N[C@@H]1CC[C@H](N2CC[C@H](NC(=O)OCc3ccccc3)C2=O)[C@H](CS(C)(=O)=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.