Using CS(=O)(=O)Cl, CS(=O)(=O)c1ccc(C2OC(=O)NC2CO)cc1 to produce CS(=O)(=O)OCC1NC(=O)OC1c1ccc(S(C)(=O)=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.