Using CCCCCCCCCCCCc1ccsc1Br, CCCC[Sn](Cl)(CCCC)CCCC to produce CCCCCCCCCCCCc1ccsc1[Sn](CCCC)(CCCC)CCCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.