Using C[C@@H](COc1cccc(Nc2cc(Br)cn(C)c2=O)n1)NC(=O)OC(C)(C)C to produce C[C@H](N)COc1cccc(Nc2cc(Br)cn(C)c2=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.