  Using a sample of $1.06 \times 10^{8}$ $\psi(2S)$ events collected with the
BESIII detector at BEPCII, the decay $\psi(2S) \to p \bar{p}\eta$ is studied. A
partial wave analysis determines that the intermediate state N(1535) with a
mass of $1524\pm5^{+10}_{-4}$ MeV/$c^2$ and a width of $130^{+27+57}_{-24-10}$
MeV/$c^2$ is dominant in the decay; the product branching fraction is
determined to be $B(\psi(2S) \to N(1535)\bar{p})\times B(N(1535)\to p\eta)+c.c.
= (5.2\pm0.3^{+3.2}_{-1.2})\times 10^{-5}$. Furthermore, the branching fraction
of $\psi(2S) \to \eta p \bar{p}$ is measured to be $(6.4\pm0.2\pm0.6)\times
10^{-5}$.
