Using CCCc1c(Cc2ccc(-c3ccccc3C#N)cc2)c(=O)[nH]c2ncnn12, CC(C)(C)OC(=O)CBr to produce CCCc1c(Cc2ccc(-c3ccccc3C#N)cc2)c(=O)n(CC(=O)OC(C)(C)C)c2ncnn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.