Using COC(=O)C(Cc1c[nH]c2ccccc12)NC(=O)C(CSC(C)=O)C1CCc2cc(Br)ccc21 to produce O=C(N[C@@H](Cc1c[nH]c2ccccc12)C(=O)O)C(CS)C1CCc2cc(Br)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.