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