Using CCCCOC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)C1(NC(=O)[C@@H](SC(C)=O)C(C)C)CCCC1 to produce CCCCOC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)C1(NC(=O)[C@@H](S)C(C)C)CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.