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We derive an analytical expression for the contribution of the order$m\alpha^2 (Z\alpha)^6$ to the hydrogen Lamb shift which comes from thediagrams for radiative corrections to the Wichmann-Kroll potential. We usemodern methods of multiloop calculations, based on IBP reduction, DRA methodand differential equations.

$\mathcal{O}\left(m\alpha^2 (Z\alpha)^6\right)$ contribution to Lamb shift from radiative corrections to the Wichmann-Kroll potential