Using C[C@H](C[C@H](O)[C@@H](N)Cc1ccccc1)C(=O)NCCC(C)(C)C, CS(=O)(=O)c1ccc(C(=O)O)s1 to produce C[C@H](C[C@H](O)[C@H](Cc1ccccc1)NC(=O)c1ccc(S(C)(=O)=O)s1)C(=O)NCCC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.