Using COC(=O)[C@H](CNC(=O)c1cccs1)NC(=O)c1sc(C(=O)NCc2cccc(O)c2)cc1Br to produce O=C(NC[C@H](NC(=O)c1sc(C(=O)NCc2cccc(O)c2)cc1Br)C(=O)O)c1cccs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.