Using C=C[Sn](CCCC)(CCCC)CCCC, CN1C=CC(c2c[nH]c3c(Br)cc(OS(=O)(=O)c4ccccc4)cc23)=CC1 to produce C=Cc1cc(OS(=O)(=O)c2ccccc2)cc2c(C3CCN(C)CC3)c[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.