Quantum chromodynamics quark benzene
  A six-quark state with the benzene-like structure is proposed and studied based on color string model. The calculation with the quadratic confinement show that such structure has the lowest energy among the various hidden color six-quark structures proposed so far. Its possible effect on $NN$ scattering is discussed. 
Jialun Ping, Chengrong Deng, Fan Wang, T. Goldman