By adding a nitro group to C10 (AZO-3), stark effects are observed. Firstly, the highenergy states are convoluted by the strongest peak observed for all other nuclei in all three molecules. The increase of B C value also applies to the other carbon atoms in the left phenyl ring, especially in the transitions that are localized on the nitro group. The hydrogens seem to be unaffected by the electron-withdrawing group. TD-DFT and CC2 produce similar spectra for C10 but not for C5.