Using CC(C)(C)OC(=O)NC1(C=O)CCOCC1, Nc1ccc(Br)cc1 to produce CC(C)(C)OC(=O)NC1(CNc2ccc(Br)cc2)CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.