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The ${\rm H_{5}S_{2}}$ and ${\rm H_{2}S}$ compounds are the two candidatesfor the low-temperature phase of compressed sulfur-hydrogen system. We haveshown that the value of Coulomb pseudopotential ($\mu^{\star}$) for ${\rmH_{5}S_{2}}$ ($\left[T_{C}\right]_{\rm exp}=36$~K and $p=112$~GPa) isanomalously high. The numerical results give the limitation from below to$\mu^{\star}$ that is equal to $0.402$ ($\mu^{\star}=0.589$, if we consider thefirst order vertex corrections to the electron-phonon interaction). Presenteddata mean that the properties of superconducting phase in the ${\rmH_{5}S_{2}}$ compound can be understood within the classical framework ofEliashberg formalism only at the phenomenological level ($\mu^{\star}$ is theparameter of matching the theory to the experimental data). On the other hand,in the case of ${\rm H_{2}S}$ it is not necessary to take high value of Coulombpseudopotential to reproduce the experimental critical temperature relativelywell ($\mu^{\star}=0.15$). In our opinion, ${\rm H_{2}S}$ is mainly responsiblefor the observed superconductivity state in the sulfur-hydrogen system at lowtemperature.

Anomalously high value of Coulomb pseudopotential for the $\rm H_{5}S_{2}$ superconductor