Using CON(C)C(=O)CN(CCCc1cccc(Br)n1)C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N(CC=O)CCCc1cccc(Br)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.