Using C=C[Sn](CCCC)(CCCC)CCCC, Cc1cc(Cl)cc(-n2nc(C)nc2C)n1 to produce C=Cc1cc(C)nc(-n2nc(C)nc2C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.