Backward-angle<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>η</mml:mi></mml:mrow></mml:math>photoproduction from protons at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>E</mml:mi><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>1.6</mml:mn><mml:mo>–</mml:mo><mml:mn>2.4</mml:mn><mml:mi> </mml:mi><mml:mi mathvariant="normal">GeV</mml:mi></mml:mrow></mml:math>

Differential cross sections for $\ensuremath{\eta}$ photoproduction from protons have been measured at ${E}_{\ensuremath{\gamma}}=1.6--2.4 \mathrm{GeV}$ in the backward direction. A bump structure has been observed above $2.0$ GeV in the total energy. No such bump is observed in ${\ensuremath{\eta}}^{'},\ensuremath{\omega}$, and ${\ensuremath{\pi}}^{0}$ photoproductions. It is inferred that this unique structure in $\ensuremath{\eta}$ photoproduction is due to a baryon resonance with a large $s\overline{s}$ component that is strongly coupled to the $\ensuremath{\eta}N$ channel.