Using CCCC[Sn](CCCC)(CCCC)C1=CC2(CCCN(Cc3ccccc3)C2)OC1, COc1ccccc1Br to produce COc1ccccc1C1=CC2(CCCN(Cc3ccccc3)C2)OC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.