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