Using O=S(=O)(c1ccccc1)n1ccc2cc(Br)cnc21, C=C[Sn](CCCC)(CCCC)CCCC to produce C=Cc1cnc2c(ccn2S(=O)(=O)c2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.