Using C[C@@H](NC(=O)CNC(=O)CSC(=O)c1ccccc1)C(=O)O, CCOC(=O)CN to produce CCOC(=O)CNC(=O)[C@@H](C)NC(=O)CNC(=O)CSC(=O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.