to remind the nice mass spectra obtained with help of the phenomenological mass relation [39] obtained within the assumption of two clusters of quarks at the ends of a stretched bag in terms of color magnetic interactions: Here i and s are isospins and spins of the two clusters. Notice that the formula involves degeneracy. We adjust the two parameters M 0 =838.2 MeV and M 1 =100.3 MeV in order to reproduce the masses, spins and isospins of the nucleon and of the Roper resonnace: N ∗ (1440). Then we calculate the masses of the other structures without any free parameter. These masses, possible spins and isospins, quark configurations, and parities if only s wave are considered, are shown in Fig. 27. Notice that the parity of the Roper N ∗ (1440) is positive if a P wave between ( qqq ) and q ¯ q ) quark clusters is assumed. FIG. 27: (Color online.) Calculated properties of narrow exotic baryonic structures, using the phenomenological mass formula [39]: parity for s wave clusters, configurations as indicated, masses, possible spins and isospins. The right column shows the experimetal masses. 19 M = M 0 + M 1 [ i 1 ( i 1 + 1) + i 2 ( i 2 + 1) + (1 / 3) s 1 ( s 1 + 1)+ (3) (1 / 3) s 2 ( s 2 + 1)] (4)