Using O=c1ncc(Br)cn1CCN1CCOCC1, CCCC[Sn](CCCC)(CCCC)c1cc2nccc(Cl)c2s1 to produce O=c1ncc(-c2cc3nccc(Cl)c3s2)cn1CCN1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.