Using CCCC[Sn](/C=C\CN)(CCCC)CCCC, O=C([O-])c1sc(N2CCOCC2)nc1Br to produce O=C1NCC=Cc2nc(N3CCOCC3)sc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.