Using C[Sn](C)(C)c1nccs1, COC(=O)c1nc(Cl)cc(NC(C)=O)c1Cl to produce COC(=O)c1nc(-c2nccs2)cc(NC(C)=O)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.