Using COC(=O)c1scc(Br)c1O[C@@H](C)CNC(=O)OC(C)(C)C to produce C[C@@H](CNC(=O)OC(C)(C)C)Oc1c(Br)csc1CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.