Using CCCC[Sn](CCCC)(CCCC)c1ncco1, Cc1cccc2cc(C=O)c(Cl)nc12 to produce Cc1cccc2cc(C=O)c(-c3ncco3)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.