Using Clc1nc(NCc2ccccc2)c2scc(Br)c2n1, C=C[Sn](CCCC)(CCCC)CCCC to produce C=Cc1csc2c(NCc3ccccc3)nc(Cl)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.