Using BrCc1ccccc1, CCCC[Sn](CCCC)(CCCC)c1cnc2c(c1)CCN2[Si](C)(C)C(C)(C)C to produce c1ccc(Cc2cnc3c(c2)CCN3)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.