Using CS(=O)(=O)Cl, CC1(C)OB(c2ccc(OCCO)cc2)OC1(C)C to produce CC1(C)OB(c2ccc(OCCOS(C)(=O)=O)cc2)OC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.