Using CCOP(=O)(OCC)C(Cl)C(=O)OC(C)(C)C, COc1nn(C)c(=O)n1-c1ccsc1C=O to produce COc1nn(C)c(=O)n1-c1ccsc1C=C(Cl)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.