Is There a Third Companion of Lambda and Sigma0?
  The comparison of magnetic moments of neutron and proton reveals three possible states of a nucleon each composed of quark plus diquark. In this scheme for the quark content uds there should be three baryons with a different structure: ud+s, us+d, ds+u. So one can expect the existence of a third companion to the known baryons Lambda and Sigma0. 
A. V. Kopylov