Using Cc1nc(C(=O)N2CCC[C@H]2CNc2ncc(Br)cn2)c(-c2ccc(F)cc2)s1, C[Sn](C)(C)C to produce Cc1cnc(NC[C@@H]2CCCN2C(=O)c2nc(C)sc2-c2ccc(F)cc2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.