Using BrCC1CC1, Cc1cn(C(=O)OC(C)(C)C)c(=O)[nH]c1=O to produce Cc1cn(C(=O)OC(C)(C)C)c(=O)n(CC2CC2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.