Using CCCC[Sn](CCCC)(CCCC)c1ccccn1, Cc1ccnc(Nc2cccc(-c3cnc(Cl)o3)n2)c1 to produce Cc1ccnc(Nc2cccc(-c3cnc(-c4ccccn4)o3)n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.