Using CC(=O)NCSC[C@H](NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)O, CC(C)(C)OC(=O)[C@@H](N)c1ccccc1 to produce CC(=O)NCSC[C@H](NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)N[C@H](C(=O)OC(C)(C)C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.