  Using a chiral unitary model in which the negative parity nucleon resonance
$N^\ast \equiv N^\ast(1535)$ is generated dynamically by means of the Bethe
Salpeter equation with coupled meson baryon channels in the $S = 0$ sector, we
have obtained the $\pi^0 N^\ast N^\ast$ and $\eta N^\ast N^\ast$ couplings. The
$\pi^0 N^\ast N^\ast$ coupling has smaller strength and the same sign as the
$\pi^0 N N$ coupling. This rules out the mirror assignment of chiral symmetry
where the ground state nucleon $N$ and the negative parity resonance $N^\ast$
are envisaged as chiral partners in the baryon sector.
