Using CCOC(=O)[C@@H](CSC)NC(=O)[C@@H](Cc1ccccc1)NC(=O)OC(C)(C)C to produce CSC[C@H]1NC(=O)[C@@H](Cc2ccccc2)NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.