Using Nc1ncc(-c2ccc(S(=O)(=O)NC3CC3)cc2)nc1Br, C[Sn](C)(C)c1cc2c(cn1)C(=O)NCC2 to produce Nc1ncc(-c2ccc(S(=O)(=O)NC3CC3)cc2)nc1-c1cc2c(cn1)C(=O)NCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.