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