Using CCOc1ccc(Br)c2c1B(O)OC2C[N+](=O)[O-], C[Sn](C)(C)C to produce CCOc1ccc(C)c2c1B(O)OC2C[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.