Using CCO, COc1ccc2c(c1)Sc1ccc(C(C)C(N)=O)cc1C(=O)C2 to produce COc1ccc2c(c1)Sc1ccc(C(C)C(=O)O)cc1C(=O)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.