Using CCn1c(Br)nc2c(N)nc(NCCc3ccccc3)nc21, CCCC[Sn](CCCC)(CCCC)c1ccco1 to produce CCn1c(-c2ccco2)nc2c(N)nc(NCCc3ccccc3)nc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.