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We apply differential equations technique to the calculation of the one-loopmassless diagram with one offshell legs. Using reduction to $\epsilon$-form, wemanaged to obtain a simple one-fold integral representation exact in space-timedimensionality. Expansion of the obtained result in $\epsilon$ and analyticalcontinuation to physical region are discussed.

One-loop pentagon integral with one offshell leg in $d$ dimensions from differential equations in $\epsilon$-form