Using CCCC[Sn](CCCC)(CCCC)c1ncco1, COC[C@H]1CCCN1C(=O)c1cc(Br)cc(C(=O)OC)c1 to produce COC[C@H]1CCCN1C(=O)c1cc(C(=O)O)cc(-c2ncco2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.