Using Nc1nc(Cl)c2[nH]cnc2n1, Clc1cccc2nc(CBr)sc12 to produce Nc1nc(Cl)c2ncn(Cc3nc4cccc(Cl)c4s3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.