Using CCCC[Sn](CCCC)(CCCC)c1ccnnc1, Cc1cc(CC(=O)OC(C)(C)C)ccc1Br to produce Cc1cc(CC(=O)OC(C)(C)C)ccc1-c1ccnnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.