Using CC(O)=S, COc1ccc(COC(=O)C[C@@H]2C[C@@H](O)CN2C(=O)OCc2ccc([N+](=O)[O-])cc2)cc1 to produce COc1ccc(COC(=O)C[C@@H]2C[C@H](SC(C)=O)CN2C(=O)OCc2ccc([N+](=O)[O-])cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.