Using CCOC(=O)C1(Cc2ccc(C3=CC(=O)N(C(C)(C)C)S3(=O)=O)cc2)CCC(=O)N1 to produce CCOC(=O)C1(Cc2ccc(C3CC(=O)N(C(C)(C)C)S3(=O)=O)cc2)CCC(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.