The transition to this state differs from the S 0 → S 1 transition of trans-AB as it does not originate from a promotion of a lone-pair n to the π * orbital, but rather it is the s-type orbital of the OCC which is excited. Interestingly, the next two states recover the OCC-like character and can be identified as s-like and p/d-like. The 9th excited state located vertically at 4.0 eV is of a mixed character. As explained in the methods section, different flavors of EOM-CCSD are suitable for different types of states. In the case of pAB, we expect that EOM-EA-CCSD describes well the transitions localized on the OCC, but will give less accurate results for the transitions involving the scaffold orbitals. To gain a better handle on these states, we employ EOM-EE-CCSD. We also present wavefunction analysis of the resulting states.