Using CCOC(=O)CN(Cc1ccccc1)[C@H]1CSc2ccccc2N(CC(=O)O)C1=O to produce CCOC(=O)CN[C@H]1CSc2ccccc2N(CC(=O)O)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.