It not only fails at correctly predicting the equilibrium geometry but also at obtaining the spectrum. The best spectra are obtained for the MP2 geometry, for which the TDDFT results still show a deviation of 0.6 eV from the main experimental peak. BSE@GW improves these results by shifting the corresponding states towards higher energies. However, it fails to accurately predict the experimental spectrum if the equilibrium geometry is not correctly determined beforehand. A closer look at the CT character in Fig. reveals that the transitions contributing to the main peak have a strongly mixed character, explaining the failure of TDDFT. The BSE@GW framework appears to yield a description of different electronic transitions that does not favor a certain type of transitions, which aligns with other research that demonstrated the BSE@GW's capability of describing CT transitions. 58