  We comment on the quantum numbers and decay channels of the possible proton
antiproton bound state observed by BES Collaboration. Based on the general
symmetry consideration and available experimental information, we conclude that
the quantum number of this state is very likely to be $J^{PC}=0^{-+}, I^G=0^+$,
which can not decay into final states $\pi^+\pi^-, 2\pi^0, K{\bar K}, 3\pi$.
Besides its dissociation into $p\bar p$, the other important mesonic decay
modes could be $\eta \pi\pi$, $\eta'\pi\pi$, $\eta\eta\eta$, $4\pi$, $K{\bar
K}\pi$, $\eta K{\bar K}$, $K\bar K \pi\pi$, 6$\pi$. Experimental search of this
signal in these meson final states is strongly called for.
