Using BrCCBr, COc1cc(NC(=O)c2cc(Br)c[nH]2)ccc1OCC(C)(C)O to produce COc1cc(N2CCn3cc(Br)cc3C2=O)ccc1OCC(C)(C)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.