  We study the $N \bar D$ system by means of a chiral constituent quark model.
This model, tuned in the description of the baryon and meson spectra as well as
the $NN$ interaction, provides parameter-free predictions for the charm -1
two-hadron systems. The presence of a heavy antiquark makes the interaction
rather simple. We have found sharp quark-Pauli effects in some particular
channels, generating repulsion, due to lacking degrees of freedom to
accommodate the light quarks. Our results point to the existence of an
attractive state, the $\Delta \bar D^*$ with $(T,S)=(1,5/2)$, presenting a
resonance close to threshold. It would show up in the scattering of $\bar D$
mesons on nucleons as a D wave state with quantum numbers $(T)J^P=(1)5/2^-$.
This resonance resembles our findings in the $\Delta\Delta$ system, that
offered a plausible explanation to the cross section of double-pionic fusion
reactions through the so-called {\it ABC} effect. The study of the interaction
of $D$ mesons with nucleons is a goal of the $\bar {\rm P}$ANDA Collaboration
at the European facility FAIR and, thus, the present theoretical study is a
challenge to be tested at the future experiments.
