Using CC(C)(C)OC(=O)NC1CCN(S(=O)(=O)c2cccc3cncc(Br)c23)C1, C[Sn](C)(C)C to produce Cc1cncc2cccc(S(=O)(=O)N3CCC(NC(=O)OC(C)(C)C)C3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.