Using COC(=O)[C@H](CO)NC(=O)OC(C)(C)C, Sc1ccccc1 to produce COC(=O)[C@H](CSc1ccccc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.