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We report on the status of the ongoing calculation of multiparticlecontributions to the inclusive radiative $\bar{B} \rightarrow X_s \gamma$ decayat next-to leading order. This effort amounts to the evaluation of thefour-particle process $b\rightarrow s \bar{q} q \gamma$ at the one-loop level,supplemented by the corresponding five-particle tree-level cuts $b\rightarrow s\bar{q} q \gamma + g$ of the gluon bremsstrahlung. Knowledge of these pieceswill formally complete the $\bar{B} \rightarrow X_s \gamma$ decay at thenext-to-leading order. The different steps such as the generation of theamplitude, its renormalization, and the treatment of occurring IR-divergencesare discussed. Moreover, we elaborate on the subtleties that arise whentreating $\gamma_5$ in $D$ dimensions.

Completing the four-body contributions to $\bar{B}\rightarrow X_s \gamma$ at NLO