Using CCCC[Sn](/C=C/C(C)(C)C)(CCCC)CCCC, CCOC(=O)c1noc(Br)c1C to produce CCOC(=O)c1noc(/C=C/C(C)(C)C)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.