Using Clc1ccc2c(cc(Br)n2Cc2ccccc2)n1, CCCC[Sn](CCCC)(CCCC)c1cncs1 to produce Clc1ccc2c(cc(-c3cncs3)n2Cc2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.